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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]                      
Federal, Current                 $ 168,596 $ 167,745 $ 134,938
Federal, Deferred                 12,866 2,262 14,784
Federal income tax provision, Total                 181,462 170,007 149,722
State, Current                 20,948 21,109 17,037
State, Deferred                 1,628 297 1,136
State income tax provision, Total                 22,576 21,406 18,173
Income tax provision, Total $ 51,581 $ 55,640 $ 52,889 $ 43,928 $ 50,594 $ 51,174 $ 48,944 $ 40,701 $ 204,038 $ 191,413 $ 167,895