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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 21,340,088 | $ 18,628,787 | $ 17,369,108
Depreciation and amortization | 451,988 | 406,114 | 366,927
Equity income from unconsolidated subsidiaries | 324,664 | 210,207 | 197,351
Adjusted EBITDA | 1,905,168 | 1,716,774 | 1,562,347
Americas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 13,131,906 | 11,791,377 | 11,069,965
Depreciation and amortization | 327,556 | 289,338 | 254,118
Equity income from unconsolidated subsidiaries | 14,177 | 18,789 | 17,892
Adjusted EBITDA | 1,111,014 | 1,011,643 | 950,573
EMEA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 5,465,923 | 4,396,825 | 4,128,906
Depreciation and amortization | 80,290 | 72,322 | 66,619
Equity income from unconsolidated subsidiaries | 1,523 | 1,553 | 1,817
Adjusted EBITDA | 329,522 | 309,233 | 272,894
Asia Pacific [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 2,207,535 | 1,983,486 | 1,729,528
Depreciation and amortization | 20,297 | 18,258 | 17,810
Equity income from unconsolidated subsidiaries | 433 | 397 | 223
Adjusted EBITDA | 197,684 | 180,043 | 142,299
Global Investment Management [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 434,405 | 377,644 | 369,800
Depreciation and amortization | 23,017 | 24,123 | 25,911
Equity income from unconsolidated subsidiaries | 6,131 | 7,923 | 7,243
Adjusted EBITDA | 78,469 | 94,373 | 83,150
Development Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 100,319 | 79,455 | 70,909
Depreciation and amortization | 828 | 2,073 | 2,469
Equity income from unconsolidated subsidiaries | 302,400 | 181,545 | 170,176
Adjusted EBITDA | $ 188,479 | $ 121,482 | $ 113,431

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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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