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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments in unconsolidated subsidiaries at fair value using NAV $ 59,000   $ 45,200
Non-cash asset impairment charges $ 75,171 $ 89,037  
Intangible asset impairment   $ 89,000  
4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 4.875%   4.875%
5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate of long-term debt 5.25%   5.25%
Estimated Fair Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior term loans $ 752,700   $ 745,500
Estimated Fair Value [Member] | 4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 697,400   670,700
Estimated Fair Value [Member] | 5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 482,600   478,300
Actual Carrying Value [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior term loans 765,700   744,600
Actual Carrying Value [Member] | 4.875% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 594,300   593,600
Actual Carrying Value [Member] | 5.25% Senior Notes [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Senior notes 423,200   $ 423,000
Global Workplace Solutions [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Non-cash asset impairment charges 50,200    
Real Estate Investments [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Non-cash goodwill impairment charge $ 25,000