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Income Taxes - Provision (Benefit) for Income Tax Attributable to Income (Loss) from Continuing Operations before Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 70,098 $ 95,814 $ 90,387
State 10,941 8,961 8,744
Total current taxes 81,039 104,775 99,131
Deferred:      
Federal (350) 37,151 5,749
State 9,863 10,341 1,214
Total deferred taxes 9,513 47,492 6,963
Total income tax expense $ 90,552 $ 152,267 $ 106,094