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Goodwill - Schedule of Changes in Goodwill by Segment (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Goodwill [Line Items] |
Goodwill Gross, Beginning | $ 4,720,815
Accumulated impairment losses | (1,068,506)
Goodwill, Net of impairment losses | 3,652,309
Purchase accounting entries | 7,226
Foreign exchange movement | 4,347
Goodwill Gross, Ending | 4,732,388
Accumulated impairment losses | (1,068,506)
Goodwill, Net of impairment losses | 3,663,882
Advisory Services [Member] |
Goodwill [Line Items] |
Goodwill Gross, Beginning | 3,269,954
Accumulated impairment losses | (761,448)
Goodwill, Net of impairment losses | 2,508,506
Purchase accounting entries | 7,518
Foreign exchange movement | (1,608)
Goodwill Gross, Ending | 3,275,864
Accumulated impairment losses | (761,448)
Goodwill, Net of impairment losses | 2,514,416
Global Workplace Solutions [Member] |
Goodwill [Line Items] |
Goodwill Gross, Beginning | 875,570
Accumulated impairment losses | (175,473)
Goodwill, Net of impairment losses | 700,097
Purchase accounting entries | (292)
Foreign exchange movement | 7,289
Goodwill Gross, Ending | 882,567
Accumulated impairment losses | (175,473)
Goodwill, Net of impairment losses | 707,094
Real Estate Investments [Member] |
Goodwill [Line Items] |
Goodwill Gross, Beginning | 575,291
Accumulated impairment losses | (131,585)
Goodwill, Net of impairment losses | 443,706
Foreign exchange movement | (1,334)
Goodwill Gross, Ending | 573,957
Accumulated impairment losses | (131,585)
Goodwill, Net of impairment losses | $ 442,372

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