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Income Taxes - Summary of Components of Income Tax Provision (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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