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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018
Income Taxes [Line Items]
Income tax expense (benefit)	$ 13,787,000	$ 6,635,000	$ 40,595,000	$ 41,354,000
Effective tax rate	26.90%	40.00%	24.70%	37.00%
Excess tax expense (benefits) from discrete items	$ 200,000		$ (2,000,000)
Unfavorable effect from income tax accrual adjustment relating to return to provision true ups	$ 900,000	$ 200,000	$ 900,000
Effect of reporting discrete items during the period	0.40%		1.30%
Excess tax benefits from stock-based compensation awards	$ 700,000		$ 3,300,000	$ 800,000
Income tax expense credit				$ 1,200,000
Other miscellaneous items			$ 400,000
Statutory Effective Tax Rate [Member]
Income Taxes [Line Items]
State income tax rate, net of federal benefit			3.70%
U.S. federal statutory rate			21.00%
Internal Revenue Service (IRS) [Member] | Tax Year 2015 [Member]
Income Taxes [Line Items]
Income tax examination, adjustment from settlement with taxing authority	$ 0		$ 0
Forecast [Member]
Income Taxes [Line Items]
Effective tax rate					26.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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