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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pretax and After-Tax (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Equity [Abstract]    
Net unrealized gains (losses) on available for sale investments arising during the periods, Pretax $ (4,246) $ (4,246)
Less: realized gains (losses) on investments, Pretax 1 1
Change in net unrealized gains (losses) on available for sale investments, Pretax (4,245) (4,245)
Other comprehensive income (loss), Pretax (4,245) (4,245)
Net unrealized gains (losses) on available for sale investments arising during the periods, Tax (1,638) (1,638)
Less: realized gains (losses) on investments, Tax      
Change in net unrealized gains (losses) on available for sale investments, Tax (1,638) (1,638)
Other comprehensive income (loss), Tax (1,638) (1,638)
Net unrealized gains (losses) on available for sale investments arising during the periods, After-tax (2,608) (2,608)
Less: realized gains (losses) on investments, After-tax      
Change in net unrealized gains (losses) on available for sale investments, After-tax (2,608) (2,608) [1]
Other comprehensive income (loss), After-tax $ (2,608) $ (2,608)
[1] Represents change in fair value of AFS investments for the period presented, net of tax benefit of $1,638 thousand.