Segment and Geographic Information - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 520,753	$ 450,557	$ 426,449
Long-lived assets	56,311	55,894	47,468
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	136,611	119,781	120,523
Long-lived assets	40,404	40,742	33,750
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	231,731	199,127	195,214
Long-lived assets	12,981	12,498	10,941
Greater China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	63,471	54,137	38,184
Long-lived assets	994	873	858
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	88,940	77,512	72,528
Long-lived assets	$ 1,932	$ 1,781	$ 1,919