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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

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- 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. + Details
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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 + Details
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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 No definition available. + Details
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