| Line | 
           Label | 
           Object Class | 
           Period Type | 
           Balance | 
           Report ElementName | 
        
        
           | 1 | 
           Key Ratios | 
           [Network] | 
           *  | 
           *  | 
           http://www.xbrlsite.com/2015/fro/us-gaap/xbrl/Ontology/keyRatios/role/KeyRatios | 
        
        
           | 2 | 
           Key Financial Ratio | 
           Abstract  | 
            | 
            | 
           fro:KeyFinancialRatio | 
        
        
           | 3 | 
           Capital Asset Pricing Model (CAPM) | 
           Abstract  | 
            | 
            | 
           keyRatios:CapitalAssetPricingModelCAPM | 
        
        
           | 4 | 
           Average Return to Equity Shares Across Total Market | 
           Abstract  | 
            | 
            | 
           keyRatios:AverageReturnToEquitySharesAcrossTotalMarket | 
        
        
           | 5 | 
           Market Premium | 
           Abstract  | 
            | 
            | 
           keyRatios:MarketPremium | 
        
        
           | 6 | 
           Market Return | 
           Abstract  | 
            | 
            | 
           keyRatios:MarketReturn | 
        
        
           | 7 | 
           Risk Free Rate | 
           Abstract  | 
            | 
            | 
           keyRatios:RiskFreeRate | 
        
        
           | 8 | 
           Riskiness of Specific Share (BETA) | 
           Abstract  | 
            | 
            | 
           keyRatios:RiskinessSpecificShareBETA | 
        
        
           | 9 | 
           Corporate Liquidity | 
           Abstract  | 
            | 
            | 
           keyRatios:CorporateLiquidity | 
        
        
           | 10 | 
           Current Ratio | 
           Abstract  | 
            | 
            | 
           keyRatios:CurrentRatio | 
        
        
           | 11 | 
           Debt to Equity Ratio (D/E) | 
           Abstract  | 
            | 
            | 
           keyRatios:DebtToEquityRatioDE | 
        
        
           | 12 | 
           Interest Cover | 
           Abstract  | 
            | 
            | 
           keyRatios:InterestCover | 
        
        
           | 13 | 
           Quick Ratio | 
           Abstract  | 
            | 
            | 
           keyRatios:QuickRatio | 
        
        
           | 14 | 
           Working Capital to Sales | 
           Abstract  | 
            | 
            | 
           keyRatios:WorkingCapitalToSales | 
        
        
           | 15 | 
           Working Capital (WC) | 
           Abstract  | 
            | 
            | 
           keyRatios:WorkingCapitalWC | 
        
        
           | 16 | 
           Corporate Value | 
           Abstract  | 
            | 
            | 
           keyRatios:CorporateValue | 
        
        
           | 17 | 
           Dividends Cover and Payout Ratio | 
           Abstract  | 
            | 
            | 
           keyRatios:DividendsCoverPayoutRatio | 
        
        
           | 18 | 
           Dividends Per Share (DPS) | 
           Abstract  | 
            | 
            | 
           keyRatios:DividendsPerShareDPS | 
        
        
           | 19 | 
           Dividends Yield | 
           Abstract  | 
            | 
            | 
           keyRatios:DividendsYield | 
        
        
           | 20 | 
           Earnings Yield | 
           Abstract  | 
            | 
            | 
           keyRatios:EarningsYield | 
        
        
           | 21 | 
           Market Capitalization | 
           Abstract  | 
            | 
            | 
           keyRatios:MarketCapitalization | 
        
        
           | 22 | 
           Market to Book Ratio | 
           Abstract  | 
            | 
            | 
           keyRatios:MarketToBookRatio | 
        
        
           | 23 | 
           Price to Earnings Ratio (PE) | 
           Abstract  | 
            | 
            | 
           keyRatios:PriceToEarningsRatioPE | 
        
        
           | 24 | 
           Investment Ratios | 
           Abstract  | 
            | 
            | 
           keyRatios:InvestmentRatios | 
        
        
           | 25 | 
           Discount Factor | 
           Abstract  | 
            | 
            | 
           keyRatios:DiscountFactor | 
        
        
           | 26 | 
           Internal Rate of Return (IRR) | 
           Abstract  | 
            | 
            | 
           keyRatios:InternalRateReturnIRR | 
        
        
           | 27 | 
           Investment | 
           Abstract  | 
            | 
            | 
           keyRatios:Investment | 
        
        
           | 28 | 
           Net Present Value (NPV) | 
           Abstract  | 
            | 
            | 
           keyRatios:NetPresentValueNPV | 
        
        
           | 29 | 
           Present Value | 
           Abstract  | 
            | 
            | 
           keyRatios:PresentValue | 
        
        
           | 30 | 
           Return | 
           Abstract  | 
            | 
            | 
           keyRatios:Return | 
        
        
           | 31 | 
           Weighted Average Cost of Capital (WACC) | 
           Abstract  | 
            | 
            | 
           keyRatios:WeightedAverageCostCapitalWACC | 
        
        
           | 32 | 
           Management Decision Making | 
           Abstract  | 
            | 
            | 
           keyRatios:ManagementDecisionMaking | 
        
        
           | 33 | 
           Cost, Volume, Price Relationships | 
           Abstract  | 
            | 
            | 
           keyRatios:CostVolumePriceRelationships | 
        
        
           | 34 | 
           Break Even Point Units (B/E) | 
           Abstract  | 
            | 
            | 
           keyRatios:BreakEvenPointUnitsBE | 
        
        
           | 35 | 
           Contribution Margin Per Unit (CPU) | 
           Abstract  | 
            | 
            | 
           keyRatios:ContributionMarginPerUnitCPU | 
        
        
           | 36 | 
           Contribution to Sales Precentage (CPS) | 
           Abstract  | 
            | 
            | 
           keyRatios:ContributionToSalesPrecentageCPS | 
        
        
           | 37 | 
           Fixed Costs | 
           Abstract  | 
            | 
            | 
           keyRatios:FixedCosts | 
        
        
           | 38 | 
           Total Contribution | 
           Abstract  | 
            | 
            | 
           keyRatios:TotalContribution | 
        
        
           | 39 | 
           Units | 
           Abstract  | 
            | 
            | 
           keyRatios:Units | 
        
        
           | 40 | 
           Variable Costs | 
           Abstract  | 
            | 
            | 
           keyRatios:VariableCosts | 
        
        
           | 41 | 
           Operating Performance | 
           Abstract  | 
            | 
            | 
           keyRatios:OperatingPerformance | 
        
        
           | 42 | 
           Return on Investment | 
           Abstract  | 
            | 
            | 
           keyRatios:ReturnOnInvestment | 
        
        
           | 43 | 
           Return on Equity (ROE) | 
           Abstract  | 
            | 
            | 
           keyRatios:ReturnOnEquityROE | 
        
        
           | 44 | 
           Return on Total Assets (ROTA) | 
           Abstract  | 
            | 
            | 
           keyRatios:ReturnOnTotalAssetsROTA | 
        
        
           | 45 | 
           Operating Profit | 
           Abstract  | 
            | 
            | 
           keyRatios:OperatingProfit | 
        
        
           | 46 | 
           Debtor Days | 
           Abstract  | 
            | 
            | 
           keyRatios:DebtorDays | 
        
        
           | 47 | 
           Inventory Days | 
           Abstract  | 
            | 
            | 
           keyRatios:InventoryDays | 
        
        
           | 48 | 
           Sales to Accounts Receivable | 
           Abstract  | 
            | 
            | 
           keyRatios:SalesToAccountsReceivable | 
        
        
           | 49 | 
           Sales to Fixed Assets | 
           Abstract  | 
            | 
            | 
           keyRatios:SalesToFixedAssets | 
        
        
           | 50 | 
           Sales to Inventories | 
           Abstract  | 
            | 
            | 
           keyRatios:SalesToInventories | 
        
        
           | 51 | 
           Other Stuff | 
           Abstract  | 
            | 
            | 
           keyRatios:OtherStuff | 
        
        
           | 52 | 
           Assets Employed | 
           Abstract  | 
            | 
            | 
           keyRatios:AssetsEmployed | 
        
        
           | 53 | 
           Asset Turn | 
           Abstract  | 
            | 
            | 
           keyRatios:AssetTurn | 
        
        
           | 54 | 
           Average Interest Cost | 
           Abstract  | 
            | 
            | 
           keyRatios:AverageInterestCost | 
        
        
           | 55 | 
           Book Value Per Share | 
           Abstract  | 
            | 
            | 
           keyRatios:BookValuePerShare | 
        
        
           | 56 | 
           Capital Employed | 
           Abstract  | 
            | 
            | 
           keyRatios:CapitalEmployed | 
        
        
           | 57 | 
           Market Value | 
           Abstract  | 
            | 
            | 
           keyRatios:MarketValue | 
        
        
           | 58 | 
           New Equity Capital | 
           Abstract  | 
            | 
            | 
           keyRatios:NewEquityCapital | 
        
        
           | 59 | 
           New Long Term Loans | 
           Abstract  | 
            | 
            | 
           keyRatios:NewLongTermLoans | 
        
        
           | 60 | 
           Non Equity Funds | 
           Abstract  | 
            | 
            | 
           keyRatios:NonEquityFunds | 
        
        
           | 61 | 
           Non Operating Cash In Flows | 
           Abstract  | 
            | 
            | 
           keyRatios:NonOperatingCashInFlows | 
        
        
           | 62 | 
           Non Operating Cash Out Flows | 
           Abstract  | 
            | 
            | 
           keyRatios:NonOperatingCashOutFlows | 
        
        
           | 63 | 
           Operating Assets | 
           Abstract  | 
            | 
            | 
           keyRatios:OperatingAssets | 
        
        
           | 64 | 
           Operating Cash Flows | 
           Abstract  | 
            | 
            | 
           keyRatios:OperatingCashFlows | 
        
        
           | 65 | 
           Profit Before Interest and Taxes (PBIT) | 
           Abstract  | 
            | 
            | 
           keyRatios:ProfitBeforeInterestTaxesPBIT | 
        
        
           | 66 | 
           Profit Margin | 
           Abstract  | 
            | 
            | 
           keyRatios:ProfitMargin | 
        
        
           | 67 | 
           Sale of Fixed Assets | 
           Abstract  | 
            | 
            | 
           keyRatios:SaleFixedAssets | 
        
        
           | 68 | 
           Sales Margin | 
           Abstract  | 
            | 
            | 
           keyRatios:SalesMargin | 
        
        
           | 69 | 
           Sales Turn | 
           Abstract  | 
            | 
            | 
           keyRatios:SalesTurn | 
        
        
           | 70 | 
           Tax Rate | 
           Abstract  | 
            | 
            | 
           keyRatios:TaxRate | 
        
        
           | 71 | 
           Total Ordinary Funds | 
           Abstract  | 
            | 
            | 
           keyRatios:TotalOrdinaryFunds | 
        
        
           | 72 | 
           Working Capital Days | 
           Abstract  | 
            | 
            | 
           keyRatios:WorkingCapitalDays | 
        
        
           | 73 | 
           Shareholder Value Added (SVA) | 
           Abstract  | 
            | 
            | 
           keyRatios:ShareholderValueAddedSVA | 
        
        
           | 74 | 
           Terminal Value | 
           Abstract  | 
            | 
            | 
           keyRatios:TerminalValue | 
        
        
           | 75 | 
           Total Present Value | 
           Abstract  | 
            | 
            | 
           keyRatios:TotalPresentValue |