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Acquisition of Global Workplace Solutions - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 3,045,084   $ 3,085,997
Global Workplace Solutions (GWS) [Member]        
Business Acquisition [Line Items]        
Date of business purchase agreement   Sep. 01, 2015    
Purchase price paid in cash     $ 1,475,000  
Adjustments for working capital and other items     46,500  
Goodwill $ 858,000   858,000  
Goodwill recorded in connection with acquisition deductible for tax purpose 435,000   435,000  
Amortization expense of acquired intangible assets 17,900   53,800  
Additional interest expense for debt incurred to finance acquisitions 9,700   30,800  
Removal of direct costs     16,900  
Removal of tax impact     24,900  
Global Workplace Solutions (GWS) [Member] | Americas [Member]        
Business Acquisition [Line Items]        
Goodwill 406,000   406,000  
Global Workplace Solutions (GWS) [Member] | EMEA [Member]        
Business Acquisition [Line Items]        
Goodwill 438,000   438,000  
Global Workplace Solutions (GWS) [Member] | Asia Pacific [Member]        
Business Acquisition [Line Items]        
Goodwill $ 14,000   $ 14,000