Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
Valuation allowance	$ 3,000		$ 3,000
Income tax expense (benefit)	$ 13,790	$ 9,829	$ 33,520	$ 34,657
Effective tax rate			23.50%	24.10%
Decrease in effective tax rate due to increase in domestic production activities deduction			0.60%
Excess tax benefits from stock based awards			$ 3,300	$ 2,300
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2015
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2018