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Transformation Initiatives - Summary of Transformation Initiative Costs (Details) - Transformation Initiatives - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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    
Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 20,692    
Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 155,148 $ 0 $ 0
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 | Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 14,184    
Advisory Services | Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 113,987    
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 | Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 166    
Global Workplace Solutions | Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 38,179    
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 | Depreciation expense      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs 6,342    
Real Estate Investments | Subtotal      
Restructuring Cost and Reserve [Line Items]      
Total transformation initiative costs $ 2,982