Segment Information - Schedule of Geographical Areas of Which Company Operates (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 289,442	$ 282,662	$ 578,459	$ 560,444
United States [Member]
Segment Reporting Information [Line Items]
Revenues	166,112	183,111	336,843	365,742
Europe [Member]
Segment Reporting Information [Line Items]
Revenues	100,403	90,014	197,763	176,738
Other Geographies [Member]
Segment Reporting Information [Line Items]
Revenues	$ 22,927	$ 9,537	$ 43,853	$ 17,964