Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Contingency [Line Items]
Effective tax rate			35.50%	37.20%
Income tax expense	$ 3,591	$ 2,544	$ 29,510	$ 23,657
Effective income tax rate reconciliation, percentage				1.30%
Effective income tax rate reconciliation, tax credit federal research and development percentage			0.40%
Valuation allowance	$ 4,600		$ 4,600
Excess tax benefits from stock-based awards			$ 1,700
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2012
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination			2015