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Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]      
Federal $ 12,035 $ 651 $ 3,794
State 72 161 59
Total current tax provision 12,107 812 3,853
Deferred tax provision (benefit) 2,551 (1,192) (4,671)
Total tax provision (benefit) $ 14,658 $ (380) $ 239