Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense	$ 3,560	$ 5,895
Effective tax rates (as a percent)	17.50%	29.90%
Employee service share-based compensation, tax benefit realized from exercise of stock options	$ 2,057
Unrecognized tax benefits	3,165		$ 3,087
Recognized interest and penalties	51	$ 50
Accrued interest on unrecognized tax benefits	$ 1,667		$ 1,553