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Income Taxes - Effective Tax Rate Differs from Federal Statutory Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Taxes at the U.S. federal statutory rate $ 76,009 $ 118,936 $ 105,779
State income taxes, net of federal tax impact 13,603 10,712 9,539
Domestic production activities deduction 0 (7,108) (5,037)
Non-deductible transaction costs 234 541 305
Change in valuation allowance 0 3,256 (4,038)
Tax Cuts and Jobs Act (740) 21,961 0
Other, net 1,446 3,969 (454)
Total income tax expense $ 90,552 $ 152,267 $ 106,094
Effective income tax rate (percent) 25.00% 44.80% 35.10%