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Income Taxes - Summary of Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal, Current |  |  |  |  |  |  |  |  | $ 134,938 | $ 111,940 | $ 113,290
Federal, Deferred |  |  |  |  |  |  |  |  | 14,784 | 19,814 | 7,486
Federal income tax provision (benefit), Total |  |  |  |  |  |  |  |  | 149,722 | 131,754 | 120,776
State, Current |  |  |  |  |  |  |  |  | 17,037 | 13,980 | 13,895
State, Deferred |  |  |  |  |  |  |  |  | 1,136 | 1,530 | 577
State income tax provision (benefit), Total |  |  |  |  |  |  |  |  | 18,173 | 15,510 | 14,472
Income tax provision (benefit), Total | $ 44,423 | $ 45,198 | $ 42,876 | $ 35,398 | $ 36,382 | $ 41,261 | $ 38,709 | $ 30,912 | $ 167,895 | $ 147,264 | $ 135,248

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