Segment Information - Schedule of Geographical Areas of Which Company Operates (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 1,362,030	$ 1,187,038	$ 1,029,258
United States
Segment Reporting Information [Line Items]
Revenues	709,493	665,564	669,636
Europe
Segment Reporting Information [Line Items]
Revenues	556,265	427,655	270,411
Other geographies
Segment Reporting Information [Line Items]
Revenues	$ 96,272	$ 93,819	$ 89,211