Segment Information - Schedule of Geographical Areas of Which Company Operates (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 290,917	$ 289,442	$ 562,858	$ 578,459
United States
Segment Reporting Information [Line Items]
Revenues	173,613	166,112	343,929	336,843
International [Member]
Segment Reporting Information [Line Items]
Revenues	117,304	123,330	218,929	241,616
Europe
Segment Reporting Information [Line Items]
Revenues	94,754	100,403	172,692	197,763
Other Geographies
Segment Reporting Information [Line Items]
Revenues	$ 22,550	$ 22,927	$ 46,237	$ 43,853