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152 - Disclosure - Reconciliation of Income Taxes Computed at United States Federal Statutory Tax Rate to Income Tax Provision (Benefit) (Detail)
(http://www.alliednevada.com/taxonomy/role/DisclosureReconciliationOfIncomeTaxesComputedAtUnitedStatesFederalStatutoryTaxRateToIncomeTaxProvisionBenefit)
TableReconciliation Of Income Taxes [Table]
Slicers (applies to each fact value in each table cell)
Reconciliation Of Income Taxes [Line Items]Period [Axis]
2012-01-01 - 2012-12-31
2012-01-01 - 2012-09-30
2011-01-01 - 2011-12-31
2010-01-01 - 2010-12-31
Income taxed at statutory rates, amount
22,452,000  
 
15,071,000  
9,456,000  
Percentage depletion, amount
(6,933,000) 
3,000,000  
(7,688,000) 
(3,672,000) 
Basis adjustment, amount
 
 
(1,077,000) 
 
Change in valuation allowance, amount
(264,000) 
 
 
(11,466,000) 
Other, amount
1,168,000  
 
43,000  
(1,430,000) 
Income tax provision (benefit)
16,423,000  
 
 
 
6,349,000  
 
(7,112,000) 
 
Income taxed at statutory rates, percentage of pretax income
.3500  
 
.3500  
.3500  
Percentage depletion, percentage of pretax income
(.1082) 
 
(.1785) 
(.1359) 
Basis adjustment, percentage of pretax income
 
 
(.0250) 
 
Change in valuation allowance, percentage of pretax income
(.0041) 
 
 
(.4244) 
Other, percentage of pretax income
.0183  
 
.0010  
(.0529) 
Income tax provision (benefit)
.2560  
 
 
 
.1475  
 
(.2633)