Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	(5.50%)	17.70%		8.80%	(7.00%)
Deferred tax assets related to foreign tax credit, valuation allowance	$ 800			$ 800
Excess tax benefits from stock-based compensation			$ 2,000	2,514	$ 0
Undistributed earnings of Company's foreign affiliates	$ 8,400			$ 8,400