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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 3,193,487 | $ 2,712,559 | $ 9,247,758 | $ 7,155,568
EBITDA | 284,555 | 326,577 | 847,068 | 869,725
Global Investment Management [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 91,807 | 114,094 | 277,924 | 318,371
EBITDA | 6,054 | 29,397 | 53,577 | 80,390
Development Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 16,499 | 18,617 | 51,163 | 45,312
EBITDA | 15,709 | 9,883 | 66,109 | 16,172
Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 1,770,369 | 1,556,648 | 5,129,684 | 4,218,753
EBITDA | 186,274 | 197,379 | 568,019 | 581,397
EMEA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 956,492 | 737,863 | 2,765,825 | 1,817,601
EBITDA | 49,774 | 56,666 | 101,690 | 114,328
Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 358,320 | 285,337 | 1,023,162 | 755,531
EBITDA | $ 26,744 | $ 33,252 | $ 57,673 | $ 77,438

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