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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 3,193,487	$ 2,712,559	$ 9,247,758	$ 7,155,568
EBITDA	284,555	326,577	847,068	869,725
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	91,807	114,094	277,924	318,371
EBITDA	6,054	29,397	53,577	80,390
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	16,499	18,617	51,163	45,312
EBITDA	15,709	9,883	66,109	16,172
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	1,770,369	1,556,648	5,129,684	4,218,753
EBITDA	186,274	197,379	568,019	581,397
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	956,492	737,863	2,765,825	1,817,601
EBITDA	49,774	56,666	101,690	114,328
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	358,320	285,337	1,023,162	755,531
EBITDA	$ 26,744	$ 33,252	$ 57,673	$ 77,438

X

- Definition

Aggregate amount of Income (Loss) before Net Interest Expense, Write-off of Financing Costs, Income Taxes, Depreciation and Amortization recognized during the period

+ References

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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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