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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 6,296,591 $ 5,252,241 $ 12,075,022 $ 10,997,368
Total Out of Scope of Topic 606 Revenue 162,022 129,143 322,470 273,184
Total Revenue 6,458,613 5,381,384 12,397,492 11,270,552
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (4,457) (4,892) (10,602) (14,410)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (4,457) (4,892) (10,602) (14,410)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,986,541 1,325,868 3,534,985 2,998,081
Total Out of Scope of Topic 606 Revenue 150,444 128,364 310,012 258,838
Total Revenue 2,136,985 1,454,232 3,844,997 3,256,919
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,082,722 3,770,433 8,108,605 7,654,962
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 4,082,722 3,770,433 8,108,605 7,654,962
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 231,785 160,832 442,034 358,735
Total Out of Scope of Topic 606 Revenue 11,578 779 12,458 14,346
Total Revenue 243,363 161,611 454,492 373,081
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,435,754 3,297,039 6,915,255 6,632,832
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,435,754 3,297,039 6,915,255 6,632,832
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 692,908 521,778 1,213,124 1,144,672
Advisory leasing | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue       (2,134)
Advisory leasing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 692,908 521,778 1,213,124 1,146,806
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 611,834 243,007 1,004,146 674,676
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 611,834 243,007 1,004,146 674,676
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 418,787 395,218 839,830 806,315
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (4,457) (4,892) (10,602) (12,276)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 423,244 400,110 850,432 818,591
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 646,968 473,394 1,193,350 1,022,130
Project management | Global Workplace Solutions        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue     1,193,350 1,022,130
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 646,968 473,394    
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 181,226 131,837 340,816 279,575
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 181,226 131,837 340,816 279,575
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 72,211 20,115 105,962 58,003
Total Out of Scope of Topic 606 Revenue 89,667 80,335 195,782 165,538
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 72,211 20,115 105,962 58,003
Total Out of Scope of Topic 606 Revenue 89,667 80,335 195,782 165,538
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,118 9,021 20,505 20,430
Total Out of Scope of Topic 606 Revenue 60,777 48,029 114,230 93,300
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,118 9,021 20,505 20,430
Total Out of Scope of Topic 606 Revenue 60,777 48,029 114,230 93,300
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 139,271 103,132 271,342 224,809
Total Out of Scope of Topic 606 Revenue       14,346
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 139,271 103,132 271,342 224,809
Total Out of Scope of Topic 606 Revenue       14,346
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 92,514 57,700 170,692 133,926
Total Out of Scope of Topic 606 Revenue 11,578 779 12,458  
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 92,514 57,700 170,692 $ 133,926
Total Out of Scope of Topic 606 Revenue $ 11,578 $ 779 $ 12,458