Credit Losses Recognized in Earnings for Debt Securities Where Portion of OTTI Recognized in OCI (Detail) - Jun. 30, 2014 - USD ($) $ in Thousands		Total	Total
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning balance	[1]	$ 8,030	$ 7,798
Additions for credit losses on securities previously recognized		254	486
Ending balance		$ 8,284	$ 8,284

[1] The beginning balance includes credit related losses included in OTTI charges recognized on debt securities in prior periods.