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Fair Value Measurement of Assets and Liabilities - Changes in Level 3 Assets Measured at Fair Value on Recurring Basis (Detail) - Available-for-sale Securities - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Changes in Level 3 Assets        
Balance, beginning of the period $ 14,712 $ 26,029 $ 19,309 $ 28,523
Total net (losses) gains included in other comprehensive income for the period (26) 341 (908) 563
Sales 0 0 (2,675) 0
Settlements (340) (669) (1,380) (3,385)
Balance, end of the period $ 14,346 $ 25,701 $ 14,346 $ 25,701