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Credit Losses Recognized in Earnings for Debt Securities Where Portion of OTTI Recognized in OCI (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]    
Beginning balance [1] $ 8,284 $ 7,798
Additions for credit losses on securities previously recognized 219 705
Ending balance $ 8,503 $ 8,503
[1] The beginning balance includes credit related losses included in OTTI charges recognized on debt securities in prior periods.