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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) (Other Invested Assets, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Invested Assets
       
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 15,034 $ 3,226 $ 3,489 $ 3,132
Included in accumulated other comprehensive income (loss) (404) 37 (834) 121
Purchases 6,500 6 18,475 16
Sales (12)   (12)  
Ending balance $ 21,118 $ 3,269 $ 21,118 $ 3,269