Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Contingency [Line Items]
Statutory tax rate, percentage	21.00%
Valuation allowance	$ 3,000
Income tax expense (benefit)	$ 7,700	$ 10,415
Effective tax rate	19.60%	21.90%
Decrease in effective tax rate due to increase in domestic production activities deduction	2.30%
Excess tax benefits from stock based awards	$ 2,300	$ 1,700
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