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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue $ 26,950,366 $ 23,170,119 $ 23,274,086
Total Out of Scope of Topic 606 Revenue 795,670 656,076 620,005
Total Revenue 27,746,036 23,826,195 23,894,091
Corporate And Reconciling Items      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue (20,356) (27,930) (22,987)
Total Out of Scope of Topic 606 Revenue 0 0 0
Total Revenue (20,356) (27,930) (22,987)
Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 8,925,577 6,573,690 8,057,108
Total Out of Scope of Topic 606 Revenue 650,182 640,872 597,529
Total Revenue 9,575,759 7,214,562 8,654,637
Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 17,098,917 15,808,033 14,601,819
Total Out of Scope of Topic 606 Revenue 0 0 0
Total Revenue 17,098,917 15,808,033 14,601,819
Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 946,228 816,326 638,146
Total Out of Scope of Topic 606 Revenue 145,488 15,204 22,476
Total Revenue 1,091,716 831,530 660,622
Facilities management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 14,166,987 13,484,692 12,283,868
Facilities management | Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 14,166,987 13,484,692 12,283,868
Advisory leasing      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3,308,171 2,458,118 3,374,767
Advisory leasing | Corporate And Reconciling Items      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,623 (2,274) (1,170)
Advisory leasing | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3,306,548 2,460,392 3,375,937
Advisory sales      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 2,789,573 1,663,959 2,164,676
Advisory sales | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 2,789,573 1,663,959 2,164,676
Property management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,717,032 1,632,937 1,678,565
Property management | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue   1,658,593  
Property management | Corporate And Reconciling Items      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue (21,979) (25,656) (21,817)
Property management | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,739,011   1,700,382
Project management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 2,931,930 2,323,341 2,317,951
Project management | Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 2,931,930 2,323,341 2,317,951
Valuation      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 733,523 614,157 630,943
Valuation | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 733,523 614,157 630,943
Commercial mortgage origination      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 313,704 130,897 154,227
Total Out of Scope of Topic 606 Revenue 387,664 446,968 421,736
Commercial mortgage origination | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 313,704 130,897 154,227
Total Out of Scope of Topic 606 Revenue 387,664 446,968 421,736
Loan servicing      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 43,218 45,692 30,943
Total Out of Scope of Topic 606 Revenue 262,518 193,904 175,793
Loan servicing | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 43,218 45,692 30,943
Total Out of Scope of Topic 606 Revenue 262,518 193,904 175,793
Investment management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 556,154 474,939 424,882
Investment management | Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 556,154 474,939 424,882
Development services      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 390,074 341,387 213,264
Total Out of Scope of Topic 606 Revenue 145,488 15,204 22,476
Development services | Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 390,074 341,387 213,264
Total Out of Scope of Topic 606 Revenue $ 145,488 $ 15,204 $ 22,476