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Goodwill - Schedule of Changes in Goodwill by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill Gross $ 4,767,264 $ 4,821,999
Accumulated impairment losses (1,093,506) (1,068,506)
Goodwill, Net of impairment losses 3,753,493  
Impairment loss (25,000)  
Purchase accounting entries related to acquisitions 18,675  
Foreign exchange movement (73,410)  
Goodwill, Net of impairment losses 3,673,758  
Advisory Services [Member]    
Goodwill [Line Items]    
Goodwill Gross 3,291,557 3,302,218
Accumulated impairment losses (761,448) (761,448)
Goodwill, Net of impairment losses 2,540,770  
Purchase accounting entries related to acquisitions 16,276  
Foreign exchange movement (26,937)  
Goodwill, Net of impairment losses 2,530,109  
Global Workspace Solutions [Member]    
Goodwill [Line Items]    
Goodwill Gross 875,220 899,506
Accumulated impairment losses (175,473) (175,473)
Goodwill, Net of impairment losses 724,033  
Purchase accounting entries related to acquisitions 11,483  
Foreign exchange movement (35,769)  
Goodwill, Net of impairment losses 699,747  
Real Estate Investments [Member]    
Goodwill [Line Items]    
Goodwill Gross 600,487 620,275
Accumulated impairment losses (156,585) $ (131,585)
Goodwill, Net of impairment losses 488,690  
Impairment loss (25,000)  
Purchase accounting entries related to acquisitions (9,084)  
Foreign exchange movement (10,704)  
Goodwill, Net of impairment losses $ 443,902