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Acquisition of Global Workplace Solutions (GWS) - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 03, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Aug. 13, 2015
Business Acquisition [Line Items]          
Senior Notes due date   Mar. 01, 2026      
Aggregate principal amount issued       $ 595,440  
Revenue   $ 14,209,608 $ 13,071,589 10,855,810  
Operating income   1,071,442 815,487 835,944  
Net income   691,479 571,973 547,132  
Direct transaction and integration cost   27,351 125,743 48,865  
Amortization expense   $ 238,700 $ 211,700 $ 175,300  
4.875% Senior Notes [Member]          
Business Acquisition [Line Items]          
Aggregate principal amount issued         $ 600,000
Interest rate of long-term debt   4.875% 4.875% 4.875% 4.875%
Aggregate principal amount issued       $ 595,440  
2015 Credit Agreement [Member] | New Tranche B-1 and Tranche B-2 Term Loan Facilities [Member]          
Business Acquisition [Line Items]          
Aggregate principal amount issued $ 400,000        
Aggregate principal amount issued $ 400,000     400,000  
Global Workplace Solutions (GWS) [Member]          
Business Acquisition [Line Items]          
Date of business purchase agreement   Sep. 01, 2015      
Purchase price payable in cash   $ 1,475,000      
Adjustments for working capital and other items   $ 46,500      
Revenue       982,000  
Operating income       27,700  
Net income       18,800  
Direct transaction and integration cost       48,900  
Amortization expense       24,200  
Amortization expense of acquired intangible assets       47,500  
Additional interest expense for debt incurred to finance acquisitions       23,900  
Removal of direct costs       48,900  
Removal of tax impact       $ 48,900