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Segments - Summarized Financial Information by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Revenue $ 5,889,168 $ 5,135,510
Adjusted EBITDA 430,351 450,032
Advisory Services [Member]    
Segment Reporting Information [Line Items]    
Revenue 1,931,524 1,834,402
Adjusted EBITDA 292,654 263,850
Global Workplace Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue 3,746,174 3,165,915
Adjusted EBITDA 99,298 99,679
Real Estate Investments [Member]    
Segment Reporting Information [Line Items]    
Revenue 211,470 135,193
Adjusted EBITDA $ 38,399 $ 86,503