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Segments - Summarized Financial Information by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Revenue $ 5,135,510 $ 4,673,952
Adjusted EBITDA 450,032 347,807
Advisory Services [Member]    
Segment Reporting Information [Line Items]    
Revenue 1,834,402 1,699,434
Adjusted EBITDA 263,850 215,432
Global Workplace Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue 3,165,915 2,827,503
Adjusted EBITDA 99,679 82,735
Real Estate Investments [Member]    
Segment Reporting Information [Line Items]    
Revenue 135,193 147,015
Adjusted EBITDA $ 86,503 $ 49,640