Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Contingency [Line Items]
Effective tax rate			34.10%	33.50%
Income tax expense (benefit)	$ 10,208	$ 2,702	$ 39,715	$ 27,871
Increase in effective tax rate due to increase in domestic production activities deduction			0.60%
Excess tax benefits from stock based awards			$ 1,400	$ 1,700
Valuation allowance	$ 4,100		$ 4,100
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2013
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2016