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Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 14, 2013
Summary Of Significant Accounting Policies [Line Items]        
Other than temporary impairment losses $ 0 $ 0 $ 0  
Cash unavailable for general corporate use 70,500,000 155,200,000    
Restricted cash 121,964,000 86,725,000    
Client deposit held $ 6,100,000,000 $ 5,900,000,000    
Amortization period of financing costs, maximum 10 years 10 years    
Total deferred financing costs, net of accumulated amortization $ 17,000,000.0 $ 18,300,000    
Write-off of financing costs on extinguished debt 2,608,000 27,982,000    
Estimated fair value of mortgage servicing rights 579,800,000 554,200,000    
Mortgage servicing rights, impairment charges 0 0    
Servicing fees from loans serviced for others 23,274,086,000 20,778,100,000 18,152,507,000  
Prepayment fees/late fees/ancillary income earned from loans servicing 14,900,000 15,900,000 13,200,000  
Reserve for claims insurance programs 125,800,000 113,000,000.0    
Reserve for claims insurance programs, current 1,800,000 2,700,000    
Servicing fees [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Servicing fees from loans serviced for others 191,800,000 167,500,000 144,200,000  
Operating, administrative and other expenses [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Business promotion and advertising costs $ 76,100,000 74,800,000 63,100,000  
Wholly Owned Property [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Ownership interest in property 100.00%      
Commercial Real Estate [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Ownership interest in property 0.00%      
2017 Credit Agreement [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Financing costs, incurred $ 5,800,000      
5.00% Senior Notes [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Write-off of financing costs on extinguished debt   8,000,000.0    
Aggregate outstanding principal amount   $ 800,000,000.0   $ 800,000,000.0
Debt Instrument Interest Rate Stated Percentage   5.00%    
Senior notes, redemption premium   $ 20,000,000.0    
Debt instrument financing costs   $ 1,600,000    
2015 Credit Agreement [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Financing costs, incurred     $ 8,000,000.0  
Internal computer software [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Capitalized and amortized period 3 years      
Maximum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives 10 years      
Maximum [Member] | Buildings and Improvements [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives 39 years      
Maximum [Member] | Land Improvements [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Estimated useful lives 15 years      
Maximum [Member] | Enterprise software development platforms [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Capitalized and amortized period 7 years      
Maximum [Member] | Goodwill and Other intangible assets [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Finite-lived intangible assets, maximum useful life 20 years      
Minimum [Member] | Enterprise software development platforms [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Capitalized and amortized period 3 years