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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 5,260,954	$ 4,638,596	$ 15,046,340	$ 13,129,133
Adjusted EBITDA	463,408	415,239	1,250,522	1,147,102
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	3,280,722	2,939,632	9,271,373	8,405,761
Adjusted EBITDA	255,813	239,061	740,009	697,997
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	1,331,436	1,088,699	3,828,142	3,009,350
Adjusted EBITDA	78,671	72,145	182,136	177,893
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	529,982	502,032	1,563,641	1,392,277
Adjusted EBITDA	41,393	43,307	118,134	111,139
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	93,061	92,122	315,698	274,451
Adjusted EBITDA	10,555	23,202	56,148	72,971
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	25,753	16,111	67,486	47,294
Adjusted EBITDA	$ 76,976	$ 37,524	$ 154,095	$ 87,102

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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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.

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