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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - Other Invested Assets - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 31,176 $ 15,034 $ 33,663 $ 3,489
Included in accumulated other comprehensive income (loss) 23 (404) 481 (834)
Equity in Limited Partnership 106   1,448  
Purchases 2,250 6,500 2,250 18,475
Distributions   (12) (4,287) (12)
Ending balance $ 33,555 $ 21,118 $ 33,555 $ 21,118