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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%

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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