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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 3,549,977 | $ 3,193,487 | $ 9,873,396 | $ 9,247,758
Adjusted EBITDA | 411,574 | 349,384 | 1,127,331 | 992,518
Global Investment Management [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 92,122 | 91,807 | 274,451 | 277,924
Adjusted EBITDA | 23,202 | 18,988 | 72,971 | 68,329
Development Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 14,450 | 16,499 | 45,312 | 51,163
Adjusted EBITDA | 35,863 | 15,709 | 85,120 | 66,109
Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,969,430 | 1,775,326 | 5,518,963 | 5,143,590
Adjusted EBITDA | 238,259 | 222,043 | 689,068 | 636,668
EMEA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,033,042 | 948,053 | 2,831,964 | 2,742,318
Adjusted EBITDA | 71,169 | 61,177 | 173,610 | 148,842
Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 440,933 | 361,802 | 1,202,706 | 1,032,763
Adjusted EBITDA | $ 43,081 | $ 31,467 | $ 106,562 | $ 72,570

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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/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 + 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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