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Activity of Credit Component of Other-than-Temporary Impairments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]        
Balance at beginning of period $ 35,786 $ 45,611 $ 37,149 $ 50,852
Initial credit impairments 190   261  
Subsequent credit impairments 28   70  
Securities sold, or expected to sell (904) (2,191) (904) (2,191)
Securities with no outstanding principal at period end (844) (746) (2,320) (5,987)
Balance at End of Period $ 34,256 $ 42,674 $ 34,256 $ 42,674