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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 6,630,575 $ 5,487,176 $ 18,705,598 $ 16,484,546
Total Out of Scope of Topic 606 Revenue 167,752 157,966 490,221 431,148
Total Revenue 6,798,327 5,645,142 19,195,819 16,915,694
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (4,795) (5,758) (15,397) (20,168)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (4,795) (5,758) (15,397) (20,168)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,245,464 1,472,871 5,780,450 4,470,953
Total Out of Scope of Topic 606 Revenue 166,683 157,139 476,694 415,976
Total Revenue 2,412,147 1,630,010 6,257,144 4,886,929
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,167,143 3,851,278 12,275,748 11,506,240
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 4,167,143 3,851,278 12,275,748 11,506,240
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 222,763 168,785 664,797 527,521
Total Out of Scope of Topic 606 Revenue 1,069 827 13,527 15,172
Total Revenue 223,832 169,612 678,324 542,693
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,480,090 3,284,688 10,395,345 9,917,520
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,480,090 3,284,688 10,395,345 9,917,520
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 869,124 549,233 2,082,248 1,693,998
Advisory leasing | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue       (2,041)
Advisory leasing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 869,124 549,233 2,082,248 1,696,039
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 673,411 348,238 1,677,557 1,022,914
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 673,411 348,238 1,677,557 1,022,914
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 427,863 400,797 1,267,693 1,207,019
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (4,795) (5,758) (15,397) (18,127)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 432,658 406,555 1,283,090 1,225,146
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 687,053 566,590 1,880,403 1,588,720
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 687,053 566,590 1,880,403 1,588,720
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 176,644 138,945 517,460 418,520
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 176,644 138,945 517,460 418,520
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 82,033 20,040 187,995 78,044
Total Out of Scope of Topic 606 Revenue 99,780 108,986 295,561 274,523
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 82,033 20,040 187,995 78,044
Total Out of Scope of Topic 606 Revenue 99,780 108,986 295,561 274,523
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 11,594 9,860 32,100 30,290
Total Out of Scope of Topic 606 Revenue 66,903 48,153 181,133 141,453
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 11,594 9,860 32,100 30,290
Total Out of Scope of Topic 606 Revenue 66,903 48,153 181,133 141,453
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 135,175 99,935 406,516 324,744
Total Out of Scope of Topic 606 Revenue       15,172
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 135,175 99,935 406,516 324,744
Total Out of Scope of Topic 606 Revenue       15,172
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 87,588 68,850 258,281 202,777
Total Out of Scope of Topic 606 Revenue 1,069 827 13,527  
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 87,588 68,850 258,281 $ 202,777
Total Out of Scope of Topic 606 Revenue $ 1,069 $ 827 $ 13,527