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Credit Losses Recognized in Earnings for Debt Securities Where Portion of Impairment Recognized in OCI (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance [1]   $ 7,798
Additions for credit losses on securities not previously recognized $ 4,646  
Additions for credit losses on securities previously recognized   705
Reduction for securities sold/realized losses $ (4,646) $ (8,503)
[1] The beginning balance includes credit-related losses included in OTTI charges recognized on debt securities in prior periods.