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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 5,111,434	$ 4,439,571	$ 9,785,386	$ 8,490,537
Adjusted EBITDA	439,307	418,686	787,114	731,863
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	3,140,427	2,826,923	5,990,651	5,466,129
Adjusted EBITDA	258,353	233,711	484,196	458,936
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	1,315,452	1,016,020	2,496,706	1,920,651
Adjusted EBITDA	66,519	70,293	103,465	105,748
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	538,200	486,899	1,033,659	890,245
Adjusted EBITDA	42,861	44,556	76,741	67,832
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	98,947	92,763	222,637	182,329
Adjusted EBITDA	15,901	23,910	45,593	49,769
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	18,408	16,966	41,733	31,183
Adjusted EBITDA	$ 55,673	$ 46,216	$ 77,119	$ 49,578

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
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-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
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-Paragraph 22
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-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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