Components of Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure Abstract
Domestic													$ 37,329	$ 63,124	$ 36,485
Foreign													(2,127)	(2,619)	11,509
Income before provision for income taxes	$ 10,696		$ 5,515		$ 5,498		$ 13,493		$ 36,498	$ 10,246	$ 4,501	$ 9,260	$ 35,202	$ 60,505	$ 47,994

[1] The Company elected to early adopt ASU 2016-09 in the fourth quarter of 2016, which requires, among other things, excess tax benefits to be recorded as a reduction of the provision for income taxes in the consolidated statement of operations, whereas they were previously recognized in equity. The Company is required to reflect any adoption adjustments as of January 1, 2016, the beginning of the annual period that includes the period of adoption. As such, certain information above includes the impact of the ASU 2016-09 adoption. See Note 2 "Significant Accounting Policies-New accounting pronouncements" for additional information related to this adoption.