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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]          
Beginning balance $ 8,030 [1] $ 7,798 [1] $ 7,478 $ 7,478 [1] $ 7,478 [1]
Additions for credit losses on securities previously recognized 254 486      
Ending balance $ 8,284 $ 8,284 $ 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.