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Network
2410402 - Disclosure - Losses And Loss Adjustment Expenses (Narrative) (Details)
(http://www.mercuryinsurance.com/role/LossesAndLossAdjustmentExpensesNarrativeDetails)
TableExtraordinary Items [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000064996 (http://www.sec.gov/CIK)
Extraordinary Item [Line Items]Period [Axis]
2013-01-01 - 2013-12-31
2012-01-01 - 2012-12-31
2011-01-01 - 2011-12-31
Extraordinary Item [Axis]Extraordinary Item [Axis]Extraordinary Item [Axis]
Catastrophe [Member]Extraordinary Item [Domain]Catastrophe [Member]Extraordinary Item [Domain]Catastrophe [Member]Extraordinary Item [Domain]
Increase in provision for insured events
 
3,000,000  
 
 
 
18,000,000  
Liability for unpaid claims in prior years
 
2,960,000  
 
42,332,000  
 
18,494,000  
Pre-tax catastrophe losses
17,000,000  
 
39,000,000  
 
18,000,000