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Credit Losses Recognized in Earnings for Debt Securities Where Portion of OTTI Recognized in OCI (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Beginning balance $ 8,284 [1] $ 7,798 [1] $ 7,478 $ 7,478 [1] $ 7,478 [1]
Additions for credit losses on securities previously recognized 219 705      
Ending balance $ 8,503 $ 8,503 $ 7,478 $ 7,478 [1] $ 7,478 [1]
[1] The beginning balance includes credit related losses included in OTTI charges recognized on debt securities in prior periods.