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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue $ 7,168,411 $ 5,778,432
Total Out of Scope of Topic 606 Revenue 164,522 160,447
Total Revenue 7,332,933 5,938,879
Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (4,888) (6,145)
Total Out of Scope of Topic 606 Revenue 0 0
Total Revenue (4,888) (6,145)
Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 2,117,461 1,548,445
Total Out of Scope of Topic 606 Revenue 130,987 159,567
Total Revenue 2,248,448 1,708,012
Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 4,805,616 4,025,883
Total Out of Scope of Topic 606 Revenue 0 0
Total Revenue 4,805,616 4,025,883
Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 250,222 210,249
Total Out of Scope of Topic 606 Revenue 33,535 880
Total Revenue 283,757 211,129
Facilities management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 3,800,688 3,479,501
Facilities management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 3,800,688 3,479,501
Advisory leasing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 772,722 520,216
Advisory leasing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 772,722 520,216
Advisory sales    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 619,827 392,312
Advisory sales | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 619,827 392,312
Property management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 450,984 421,043
Property management | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (4,888) (6,145)
Property management | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 455,872 427,188
Project management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,004,928 546,382
Project management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,004,928 546,382
Valuation    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 181,142 159,590
Valuation | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 181,142 159,590
Commercial mortgage origination    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 73,890 33,751
Total Out of Scope of Topic 606 Revenue 70,980 106,113
Commercial mortgage origination | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 73,890 33,751
Total Out of Scope of Topic 606 Revenue 70,980 106,113
Loan servicing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 14,008 15,388
Total Out of Scope of Topic 606 Revenue 60,007 53,454
Loan servicing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 14,008 15,388
Total Out of Scope of Topic 606 Revenue 60,007 53,454
Investment management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 150,567 132,071
Investment management | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 150,567 132,071
Development services    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 99,655 78,178
Total Out of Scope of Topic 606 Revenue 33,535 880
Development services | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 99,655 78,178
Total Out of Scope of Topic 606 Revenue $ 33,535 $ 880