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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 4,673,952	$ 4,050,966
Adjusted EBITDA	347,807	313,177
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	123,690	89,566
Adjusted EBITDA	29,692	25,859
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	23,325	14,217
Adjusted EBITDA	21,446	3,362
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	2,850,224	2,639,206
Adjusted EBITDA	225,843	225,225
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	1,181,254	904,631
Adjusted EBITDA	36,946	35,455
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	495,459	403,346
Adjusted EBITDA	$ 33,880	$ 23,276

X

- Definition

Adjusted EBITDA represents earnings before net interest expense, write-off of financing costs on extinguished debt, income taxes, depreciation and amortization, and is further adjusted for the impact of certain cash and non-cash charges related to acquisitions, cost-elimination expenses and certain carried interest incentive compensation (reversal) expense to align with the timing of associated revenue.

+ References

No definition available.

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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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- Definition

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+ References

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