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Segments - Summary of Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 4,673,952	$ 4,050,966
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	2,674,217	2,472,406
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	580,516	472,155
All other countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 1,419,219	$ 1,106,405

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

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