Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components Of Income Tax Expense Benefit [Line Items]
Current, Federal				$ 6,741	$ 17,864	$ 22,488
Current, State				2,963	4,565	2,952
Current, Foreign				4,322	3,853	3,195
Total current provision				14,026	26,282	28,635
Deferred, Federal				(1,120)	2,075	(11,972)
Deferred, State				(480)	(466)	(1,209)
Deferred, Foreign				(4,210)	(3,708)	(715)
Total deferred benefit				(5,810)	(2,099)	(13,896)
Total provision	$ 2,214	$ 962	$ 3,093	$ 8,216	$ 24,183	$ 14,739