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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, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue $ 5,778,432 $ 5,745,129
Total Out of Scope of Topic 606 Revenue 160,447 144,039
Total revenue 5,938,879 5,889,168
Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Total revenue (6,145) (9,518)
Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,548,445 1,672,214
Total Out of Scope of Topic 606 Revenue 159,567 130,473
Total revenue 1,708,012 1,802,687
Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 4,025,883 3,884,529
Total Out of Scope of Topic 606 Revenue 0 0
Total revenue 4,025,883 3,884,529
Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 210,249 197,904
Total Out of Scope of Topic 606 Revenue 880 13,566
Total revenue 211,129 211,470
Real Estate Investments | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (6,145) (9,518)
Total Out of Scope of Topic 606 Revenue 0 0
Total revenue (6,145) (9,518)
Facilities management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 3,479,501 3,335,793
Facilities management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 3,479,501 3,335,793
Advisory leasing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 520,216 621,082
Advisory leasing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 520,216 625,028
Advisory leasing | Real Estate Investments | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue   (3,946)
Advisory sales    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 392,312 431,669
Advisory sales | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 392,312 431,669
Property management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 421,043 412,909
Property management | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 427,188 418,481
Property management | Real Estate Investments | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (6,145) (5,572)
Project management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 546,382 548,736
Project management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 546,382 548,736
Valuation    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 159,590 147,738
Valuation | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 159,590 147,738
Commercial mortgage origination    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 33,751 37,889
Total Out of Scope of Topic 606 Revenue 106,113 85,202
Commercial mortgage origination | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 33,751 37,889
Total Out of Scope of Topic 606 Revenue 106,113 85,202
Loan servicing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 15,388 11,409
Total Out of Scope of Topic 606 Revenue 53,454 45,271
Loan servicing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 15,388 11,409
Total Out of Scope of Topic 606 Revenue 53,454 45,271
Investment management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 132,071 121,678
Investment management | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 132,071 121,678
Development services    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 78,178 76,226
Total Out of Scope of Topic 606 Revenue 880 13,566
Development services | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 78,178 76,226
Total Out of Scope of Topic 606 Revenue $ 880 $ 13,566