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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