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Segments - Summary of Geographic Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 21,340,088	$ 18,628,787	$ 17,369,108
Property and equipment, net	721,692	617,739
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	12,264,188	10,954,608	10,434,782
Property and equipment, net	512,110	432,102
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	2,586,890	2,242,973	2,150,428
Property and equipment, net	71,119	61,335
All other countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	6,489,010	5,431,206	$ 4,783,898
Property and equipment, net	$ 138,463	$ 124,302

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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