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Segments - Schedule of Identifiable Assets by Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Segment Reporting Information [Line Items] |  |
Identifiable Assets | $ 13,456,793 | $ 11,718,396
Operating Segments [Member] | Americas [Member] |  |
Segment Reporting Information [Line Items] |  |
Identifiable Assets | 7,432,532 | 5,808,332
Operating Segments [Member] | EMEA [Member] |  |
Segment Reporting Information [Line Items] |  |
Identifiable Assets | 3,168,050 | 3,013,586
Operating Segments [Member] | Asia Pacific [Member] |  |
Segment Reporting Information [Line Items] |  |
Identifiable Assets | 978,331 | 894,066
Operating Segments [Member] | Global Investment Management [Member] |  |
Segment Reporting Information [Line Items] |  |
Identifiable Assets | 1,018,999 | 1,075,691
Operating Segments [Member] | Development Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Identifiable Assets | 166,864 | 176,971
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Identifiable Assets | $ 692,017 | $ 749,750

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