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Income Taxes - Summary of Components of Income Tax Provision (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal, Current |  |  |  |  |  |  |  |  | $ 166,758 | $ 168,596 | $ 167,745
Federal, Deferred |  |  |  |  |  |  |  |  | 15,596 | 12,866 | 2,262
Federal income tax provision, Total |  |  |  |  |  |  |  |  | 182,354 | 181,462 | 170,007
State, Current |  |  |  |  |  |  |  |  | 4,296 | 20,948 | 21,109
State, Deferred |  |  |  |  |  |  |  |  | 2,553 | 1,628 | 297
State income tax provision, Total |  |  |  |  |  |  |  |  | 6,849 | 22,576 | 21,406
Income tax provision, Total | $ 49,919 | $ 44,272 | $ 51,601 | $ 43,411 | $ 51,581 | $ 55,640 | $ 52,889 | $ 43,928 | $ 189,203 | $ 204,038 | $ 191,413

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