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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 29,992 $ 5,364 $ 33,663 $ 3,489
Included in accumulated other comprehensive income (loss) 95 (204) 458 (430)
Equity in Limited Partnership 1,089   1,342  
Purchases   9,874   11,975
Distributions     (4,287)  
Ending balance $ 31,176 $ 15,034 $ 31,176 $ 15,034