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Credit Losses Recognized in Earnings for Debt Securities Where Portion of OTTI Recognized in OCI (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance [1] $ 7,798 $ 7,478
Additions for credit losses on securities previously recognized 705 320
Reduction for securities sold/realized losses $ (8,503)  
Ending balance [1]   $ 7,798
[1] The beginning balance includes credit related losses included in OTTI charges recognized on debt securities in prior periods.