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 Disclosure [Abstract]
Estimated effective rate	48.50%	44.10%	48.70%	49.70%
Income tax expense	$ 7,520	$ 6,270	$ 25,582	$ 23,375
Federal statutory rate	35.00%	35.00%	35.00%	35.00%
Income tax expense	$ 248		$ 1,338
Pre-tax federal net operating losses	$ 3,671		$ 3,671
Pre-tax federal net operating losses expiration date			2024
Tax effected NOLs - Foreign			$ 3,291