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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 3,549,977	$ 3,193,487	$ 9,873,396	$ 9,247,758
Adjusted EBITDA	411,574	349,384	1,127,331	992,518
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	92,122	91,807	274,451	277,924
Adjusted EBITDA	23,202	18,988	72,971	68,329
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	14,450	16,499	45,312	51,163
Adjusted EBITDA	35,863	15,709	85,120	66,109
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	1,969,430	1,775,326	5,518,963	5,143,590
Adjusted EBITDA	238,259	222,043	689,068	636,668
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	1,033,042	948,053	2,831,964	2,742,318
Adjusted EBITDA	71,169	61,177	173,610	148,842
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	440,933	361,802	1,202,706	1,032,763
Adjusted EBITDA	$ 43,081	$ 31,467	$ 106,562	$ 72,570

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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- 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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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