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Goodwill and Other Intangible Assets - Additional Information (Detail)
 12 Months Ended
Oct. 01, 2019
USD ($)
Jan. 01, 2019
Segment
Jun. 12, 2018
USD ($)
Dec. 31, 2019
USD ($)
Acquisition
Dec. 31, 2018
USD ($)
Acquisition
Dec. 31, 2017
USD ($)
Finite Lived Intangible Assets [Line Items]            
Global business segments | Segment   3        
Goodwill impairment       $ 0 $ 0 $ 0
Number of in-fill acquisitions completed | Acquisition       8 6  
Equity interest acquired         50.00%  
Other intangible assets, net       $ 1,379,546,000 $ 1,441,308,000  
Other intangible assets, accumulated amortization       1,358,528,000 1,180,393,000  
Intangible assets       2,612,936,000 2,462,066,000  
Intangible asset impairment       89,787,000    
Amortization expense       225,700,000 258,700,000 $ 238,700,000
Estimated annual amortization expense, 2020       167,700,000    
Estimated annual amortization expense, 2021       152,200,000    
Estimated annual amortization expense, 2022       130,400,000    
Estimated annual amortization expense, 2023       113,200,000    
Estimated annual amortization expense, 2024       101,800,000    
Customer relationships [Member]            
Finite Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization       $ 519,162,000 435,225,000  
Intangible assets, amortization period       20 years    
Intangible assets       $ 857,772,000 843,387,000  
Mortgage servicing rights [Member]            
Finite Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization       $ 319,927,000 272,852,000  
Intangible assets, amortization period       10 years    
Intangible assets       $ 803,419,000 697,322,000  
Management contracts [Member]            
Finite Lived Intangible Assets [Line Items]            
Other intangible assets, accumulated amortization       $ 138,891,000 135,835,000  
Intangible assets, amortization period       13 years    
Intangible assets       $ 142,767,000 200,251,000  
FacilitySource [Member]            
Finite Lived Intangible Assets [Line Items]            
Date of business purchase agreement     Jun. 12, 2018      
Final purchase price paid in cash     $ 266,500,000      
Purchase price payable in cash       $ 3,500,000 $ 263,000,000.0  
New England Joint Venture [Member]            
Finite Lived Intangible Assets [Line Items]            
Equity interest acquired         50.00%  
Telford Homes Plc [Member]            
Finite Lived Intangible Assets [Line Items]            
Date of business purchase agreement Oct. 01, 2019          
Final purchase price paid in cash $ 328,502,000          
Intangible assets 26,749,000          
Telford Homes Plc [Member] | Trademarks [Member]            
Finite Lived Intangible Assets [Line Items]            
Intangible assets $ 26,749,000          
Acquired finite-lived intangible assets 20 years          
Global Workplace Solutions (GWS) [Member] | Trademarks [Member]            
Finite Lived Intangible Assets [Line Items]            
Intangible assets, amortization period       20 years    
Intangible assets       $ 280,000,000