Segment Information - Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 4,583,660	$ 4,504,571	$ 4,514,810
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,530,000	2,390,000	2,460,000
North America | North American Region
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	2,682,974	2,532,375	2,599,606
International Region
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,900,686	1,972,196	1,915,204
International Region | EMEA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,129,667	1,056,392	1,018,705
International Region | Latin America
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	455,184	565,416	554,113
International Region | Asia Pacific
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 315,835	$ 350,388	$ 342,386