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Transformation Initiatives - Summary of Transformation Initiative Costs (Details) - Transformation Initiatives - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   $ 175,840  
Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   91,077  
Lease termination costs      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   47,811  
Professional fees and other      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   16,260  
Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs $ 0 155,148 $ 0
Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   20,692  
Advisory Services      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   128,171  
Advisory Services | Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   57,550  
Advisory Services | Lease termination costs      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   43,225  
Advisory Services | Professional fees and other      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   13,212  
Advisory Services | Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   113,987  
Advisory Services | Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   14,184  
Global Workplace Solutions      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   38,345  
Global Workplace Solutions | Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   31,083  
Global Workplace Solutions | Lease termination costs      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   4,586  
Global Workplace Solutions | Professional fees and other      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   2,510  
Global Workplace Solutions | Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   38,179  
Global Workplace Solutions | Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   166  
Real Estate Investments      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   9,324  
Real Estate Investments | Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   2,444  
Real Estate Investments | Lease termination costs      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   0  
Real Estate Investments | Professional fees and other      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   538  
Real Estate Investments | Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   2,982  
Real Estate Investments | Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs   $ 6,342