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Fair Value Measurements - Narrative (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
investment
Mar. 31, 2020
USD ($)
Mar. 18, 2021
Dec. 31, 2020
USD ($)
Dec. 28, 2020
USD ($)
Aug. 13, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Number of investments classified as level 3 | investment 1          
Investments in unconsolidated subsidiaries at fair value using NAV $ 92,800     $ 66,300    
Asset impairments $ 0 $ 75,171        
4.875% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Interest rate of long-term debt 4.875%         4.875%
2.5% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Interest rate of long-term debt 2.50%   2.50%      
5.25% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Interest rate of long-term debt         5.25%  
Redemption of debt instrument         $ 425,000  
Estimated Fair Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior term loans $ 757,300     772,200    
Estimated Fair Value | 4.875% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior notes 681,100     702,500    
Estimated Fair Value | 2.5% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior notes 475,600          
Actual Carrying Value            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior term loans 766,300     785,700    
Actual Carrying Value | 4.875% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior notes 594,800     $ 594,500    
Actual Carrying Value | 2.5% Senior Notes | Senior Notes            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Senior notes $ 487,300          
Global Workplace Solutions            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Asset impairments   50,200        
Real Estate Investments            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Non-cash goodwill impairment charge   $ 25,000