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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 3,207,537	$ 2,390,506	$ 6,054,271	$ 4,443,009
EBITDA	309,896	296,860	562,513	543,148
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	95,737	94,053	186,117	204,277
EBITDA	25,987	12,948	47,523	50,993
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	17,891	14,422	34,664	26,695
EBITDA	18,525	753	50,400	6,289
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	1,775,756	1,434,489	3,359,315	2,662,105
EBITDA	208,407	213,956	381,745	384,018
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	961,835	585,714	1,809,333	1,079,738
EBITDA	36,702	39,479	51,916	57,662
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	356,318	261,828	664,842	470,194
EBITDA	$ 20,275	$ 29,724	$ 30,929	$ 44,186

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+ References

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+ 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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