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Goodwill and Other Intangible Assets - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business
Software
Dec. 31, 2016
USD ($)
Finite Lived Intangible Assets [Line Items]      
Equity interest acquired 50.00%    
Number of acquisitions completed during the period | Business   11  
Number of software service acquired | Software   2  
Goodwill impairment $ 0 $ 0 $ 0
Other intangible assets, net 1,441,308,000 1,399,112,000  
Other intangible assets, accumulated amortization 1,180,393,000 1,000,738,000  
Intangible assets 2,462,066,000 2,236,297,000  
Amortization expense 258,700,000 238,700,000 $ 211,700,000
Estimated annual amortization expense, 2019 208,200,000    
Estimated annual amortization expense, 2020 182,200,000    
Estimated annual amortization expense, 2021 151,400,000    
Estimated annual amortization expense, 2022 134,100,000    
Estimated annual amortization expense, 2023 119,900,000    
Customer relationships [Member]      
Finite Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 435,225,000 355,642,000  
Intangible assets, amortization period 20 years    
Intangible assets $ 843,387,000 802,597,000  
Mortgage servicing rights [Member]      
Finite Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 272,852,000 235,626,000  
Intangible assets, amortization period 10 years    
Intangible assets $ 697,322,000 608,757,000  
Management contracts [Member]      
Finite Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 135,835,000 122,450,000  
Intangible assets, amortization period 13 years    
Intangible assets $ 200,251,000 203,291,000  
Non-compete agreements [Member]      
Finite Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization 73,750,000 57,358,000  
Intangible assets $ 73,750,000 $ 73,750,000  
New England Joint Venture [Member]      
Finite Lived Intangible Assets [Line Items]      
Equity interest acquired 50.00%    
Interactive Visualization Technologies [Member]      
Finite Lived Intangible Assets [Line Items]      
Number of software service acquired | Software   1  
Technology Solutions [Member]      
Finite Lived Intangible Assets [Line Items]      
Number of software service acquired | Software   1  
Global Workplace Solutions (GWS) [Member] | Trademarks [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible assets, amortization period 20 years    
Intangible assets $ 280,000,000    
Global Workplace Solutions (GWS) [Member] | Non-compete agreements [Member]      
Finite Lived Intangible Assets [Line Items]      
Intangible assets, amortization period 3 years    
Intangible assets $ 74,000,000