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Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:                      
Federal                 $ 60,764 $ 76,966 $ 64,006
State                 8,732 8,589 4,831
Current Income Tax Expense (Benefit), Total                 69,496 85,555 68,837
Deferred:                      
Federal                 (10,708) (6,189) 7,961
State                 (799) 843 891
Deferred Income Tax Expense (Benefit)                 (11,507) (5,346) 8,852
Tax expense recorded as an increase of paid-in capital                     9,921
Income Tax Expense (Benefit), Total $ 18,263 $ 8,720 $ 13,960 $ 17,046 $ 23,320 $ 21,266 $ 15,485 $ 20,138 $ 57,989 $ 80,209 $ 87,610