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Segments - Summarized Financial Information by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Revenue $ 5,645,142 $ 5,925,101 $ 16,915,694 $ 16,774,684
Adjusted EBITDA 441,764 454,630 1,139,419 1,373,154
Advisory Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 1,754,165 2,240,712 5,238,618 6,254,072
Adjusted EBITDA 236,369 345,482 662,129 942,860
Global Workplace Solutions [Member]        
Segment Reporting Information [Line Items]        
Revenue 3,721,365 3,555,176 11,134,383 10,106,543
Adjusted EBITDA 140,523 95,209 355,768 298,948
Real Estate Investments [Member]        
Segment Reporting Information [Line Items]        
Revenue 169,612 129,213 542,693 414,069
Adjusted EBITDA $ 64,872 $ 13,939 $ 121,522 $ 131,346