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Goodwill - Schedule of Changes in Goodwill by Segment (Detail)
$ in Thousands
 3 Months Ended
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