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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 14,209,608 | $ 13,071,589 | $ 10,855,810
Depreciation and amortization | 406,114 | 366,927 | 314,096
Equity income from unconsolidated subsidiaries | 210,207 | 197,351 | 162,849
Adjusted EBITDA | 1,709,534 | 1,561,003 | 1,412,724
Global Investment Management [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 377,644 | 369,800 | 460,700
Depreciation and amortization | 24,123 | 25,911 | 29,020
Equity income from unconsolidated subsidiaries | 7,923 | 7,243 | 5,972
Adjusted EBITDA | 94,373 | 83,151 | 134,240
Development Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 77,627 | 71,414 | 65,643
Depreciation and amortization | 2,073 | 2,469 | 2,218
Equity income from unconsolidated subsidiaries | 181,545 | 170,176 | 136,447
Adjusted EBITDA | 119,654 | 113,937 | 90,066
Americas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 7,860,239 | 7,246,459 | 6,201,676
Depreciation and amortization | 289,338 | 254,118 | 198,986
Equity income from unconsolidated subsidiaries | 18,789 | 17,892 | 18,413
Adjusted EBITDA | 1,013,864 | 950,355 | 858,174
EMEA [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 4,164,789 | 3,884,596 | 2,984,312
Depreciation and amortization | 72,322 | 66,619 | 68,263
Equity income from unconsolidated subsidiaries | 1,553 | 1,817 | 1,934
Adjusted EBITDA | 305,743 | 271,648 | 212,687
Asia Pacific [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 1,729,309 | 1,499,320 | 1,143,479
Depreciation and amortization | 18,258 | 17,810 | 15,609
Equity income from unconsolidated subsidiaries | 397 | 223 | 83
Adjusted EBITDA | $ 175,900 | $ 141,912 | $ 117,557

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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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