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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 7,604,491 $ 6,296,591 $ 14,772,902 $ 12,075,022
Total Out of Scope of Topic 606 Revenue 166,787 162,022 331,309 322,470
Total Revenue 7,771,278 6,458,613 15,104,211 12,397,492
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (2,131) (4,457) (7,019) (10,602)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (2,131) (4,457) (7,019) (10,602)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,438,084 1,986,541 4,555,545 3,534,985
Total Out of Scope of Topic 606 Revenue 149,899 150,444 280,886 310,012
Total Revenue 2,587,983 2,136,985 4,836,431 3,844,997
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,908,145 4,082,722 9,713,761 8,108,605
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 4,908,145 4,082,722 9,713,761 8,108,605
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 260,393 231,785 510,615 442,034
Total Out of Scope of Topic 606 Revenue 16,888 11,578 50,423 12,458
Total Revenue 277,281 243,363 561,038 454,492
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,820,120 3,435,754 7,620,808 6,915,255
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 3,820,120 3,435,754 7,620,808 6,915,255
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 969,708 692,908 1,742,430 1,213,124
Advisory leasing | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue       0
Advisory leasing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 969,708 692,908 1,742,430 1,213,124
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 715,719 611,834 1,335,546 1,004,146
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 715,719 611,834 1,335,546 1,004,146
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 458,861 418,787 909,845 839,830
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (2,131) (4,457) (7,019) (10,602)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 460,992 423,244 916,864 850,432
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,088,025 646,968 2,092,953 1,193,350
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,088,025 646,968 2,092,953 1,193,350
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 196,539 181,226 377,681 340,816
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 196,539 181,226 377,681 340,816
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 81,293 72,211 155,183 105,962
Total Out of Scope of Topic 606 Revenue 79,090 89,667 150,070 195,782
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 81,293 72,211 155,183 105,962
Total Out of Scope of Topic 606 Revenue 79,090 89,667 150,070 195,782
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 13,833 5,118 27,841 20,505
Total Out of Scope of Topic 606 Revenue 70,809 60,777 130,816 114,230
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 13,833 5,118 27,841 20,505
Total Out of Scope of Topic 606 Revenue 70,809 60,777 130,816 114,230
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 157,554 139,271 308,121 271,342
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 157,554 139,271 308,121 271,342
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 102,839 92,514 202,494 170,692
Total Out of Scope of Topic 606 Revenue 16,888 11,578 50,423 12,458
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 102,839 92,514 202,494 170,692
Total Out of Scope of Topic 606 Revenue $ 16,888 $ 11,578 $ 50,423 $ 12,458