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Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill Gross | $ 4,821,999 | $ 4,720,815 | $ 4,323,246
Accumulated impairment losses | (1,068,506) | (1,068,506) | (1,068,506)
Goodwill, Net of impairment losses | 3,652,309 | 3,254,740 |
Purchase accounting entries related to acquisitions | 79,377 | 471,204 |
Foreign exchange movement | 21,807 | (73,635) |
Goodwill, Net of impairment losses | 3,753,493 | 3,652,309 |
Advisory Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill Gross | 3,302,218 | 3,269,954 | 3,107,787
Accumulated impairment losses | (761,448) | (761,448) | (761,448)
Goodwill, Net of impairment losses | 2,508,506 | 2,346,339 |
Purchase accounting entries related to acquisitions | 29,544 | 188,071 |
Foreign exchange movement | 2,720 | (25,904) |
Goodwill, Net of impairment losses | 2,540,770 | 2,508,506 |
Global Workplace Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill Gross | 899,506 | 875,570 | 623,355
Accumulated impairment losses | (175,473) | (175,473) | (175,473)
Goodwill, Net of impairment losses | 700,097 | 447,882 |
Purchase accounting entries related to acquisitions | 7,657 | 288,243 |
Foreign exchange movement | 16,279 | (36,028) |
Goodwill, Net of impairment losses | 724,033 | 700,097 |
Real Estate Investments [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill Gross | 620,275 | 575,291 | 592,104
Accumulated impairment losses | (131,585) | (131,585) | $ (131,585)
Goodwill, Net of impairment losses | 443,706 | 460,519 |
Purchase accounting entries related to acquisitions | 42,176 | (5,110) |
Foreign exchange movement | 2,808 | (11,703) |
Goodwill, Net of impairment losses | $ 488,690 | $ 443,706 |

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