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Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 21, 2016
Jan. 01, 2016
Mar. 14, 2013
Summary Of Significant Accounting Policies [Line Items]            
Other than temporary impairment losses $ 0 $ 0 $ 0      
Cash unavailable for general corporate use 155,200,000 123,800,000        
Restricted cash 86,725,000 73,045,000        
Client deposit held $ 5,900,000,000 $ 4,000,000,000        
Amortization period of financing costs, maximum 10 years 10 years        
Total deferred financing costs, net of accumulated amortization $ 18,300,000 $ 23,000,000        
Write-off of financing costs on extinguished debt 27,982,000          
Estimated fair value of mortgage servicing rights 554,200,000 446,300,000        
Mortgage servicing rights, impairment charges 0 0 0      
Servicing fees from loans serviced for others 20,658,939,000 18,048,487,000 16,830,004,000      
Prepayment fees/late fees/ancillary income earned from loans servicing 15,900,000 13,200,000 7,200,000      
Cumulative effect adjustment to accumulated earnings         $ 3,300,000  
Reserve for claims insurance programs 113,000,000 93,700,000        
Reserve for claims insurance programs, current 2,700,000 2,800,000        
Servicing fees [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Servicing fees from loans serviced for others 167,500,000 144,200,000 115,300,000      
Operating, administrative and other expenses [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Business promotion and advertising costs $ 74,800,000 $ 63,100,000 $ 65,800,000      
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%          
5.00% Senior Notes [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Aggregate outstanding principal amount $ 800,000,000         $ 800,000,000
Debt Instrument Interest Rate Stated Percentage 5.00% 5.00%        
Senior notes, redemption premium $ 20,000,000          
Write-off of financing costs on extinguished debt $ 8,000,000          
5.00% Senior Notes [Member] | Tranche A term loan facility [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Aggregate outstanding principal amount           $ 550,000,000
2015 Credit Agreement [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Financing costs, incurred   $ 8,000,000   $ 5,400,000    
2015 Credit Agreement [Member] | Tranche A term loan facility [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Amounts available to borrow under Credit Agreement   750,000,000        
2015 Credit Agreement [Member] | Revolving credit facility [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Amounts available to borrow under Credit Agreement   $ 2,800,000,000        
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] | 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