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Goodwill and Other Intangible Assets - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business
Dec. 31, 2014
USD ($)
Finite-Lived Intangible Assets [Line Items]      
Number of acquisitions completed during the period | Business   8  
Goodwill impairment $ 1,068,506 $ 1,068,506 $ 1,068,506
Other intangible assets, net 1,411,039 1,450,469  
Other intangible assets, accumulated amortization 771,673 589,236  
Indefinite lived intangible assets excluding goodwill 176,255 180,343  
Amortizable intangible assets 2,006,457 1,859,362  
Amortization expense 211,700 175,300 $ 138,100
Estimated annual amortization expense, 2017 206,700    
Estimated annual amortization expense, 2018 186,000    
Estimated annual amortization expense, 2019 132,900    
Estimated annual amortization expense, 2020 111,800    
Estimated annual amortization expense, 2021 97,400    
Mortgage servicing rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 180,563 133,272  
Amortizable intangible assets, net servicing income expected to received, Maximum, years 10 years    
Amortizable intangible assets $ 501,087 377,995  
Management contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 99,733 87,687  
Amortizable intangible assets, net servicing income expected to received, Maximum, years 13 years    
Indefinite lived intangible assets excluding goodwill $ 101,355 103,143  
Amortizable intangible assets 177,014 180,099  
Other amortizable intangible assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 92,871 76,779  
Amortizable intangible assets, net servicing income expected to received, Maximum, years 20 years    
Amortizable intangible assets $ 138,312 110,731  
Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite lived intangible assets excluding goodwill 56,800 56,800  
Customer relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization $ 270,447 195,056  
Amortizable intangible assets, net servicing income expected to received, Maximum, years 20 years    
Amortizable intangible assets $ 761,290 746,814  
Trade names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite lived intangible assets excluding goodwill 18,100 20,400  
Non-compete agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Other intangible assets, accumulated amortization 32,777 8,194  
Amortizable intangible assets $ 73,750 73,750  
Norland [Member] | Trade names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets   35,000  
Global Workplace Solutions (GWS) [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, net servicing income expected to received, Maximum, years 20 years    
Amortization expense   $ 24,200  
Global Workplace Solutions (GWS) [Member] | Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Indefinite lived intangible assets excluding goodwill $ 280,000    
Global Workplace Solutions (GWS) [Member] | Non-compete agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, net servicing income expected to received, Maximum, years 3 years    
Indefinite lived intangible assets excluding goodwill $ 74,000