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Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 03, 2015
Dec. 12, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 21, 2016
Jan. 01, 2016
Sep. 26, 2014
Oct. 08, 2010
Summary Of Significant Accounting Policies [Line Items]                  
Cash unavailable for general corporate use     $ 73,300,000 $ 70,200,000          
Restricted cash     $ 68,836,000 $ 72,764,000          
Amortization period of financing costs, maximum     10 years 10 years          
Total deferred financing costs, net of accumulated amortization     $ 22,200,000 $ 22,100,000          
Aggregate principal amount issued       595,440,000 $ 426,875,000        
Financing expenses     $ 10,935,000 12,311,000 13,155,000        
Write-off of financing costs on extinguished debt       2,685,000 23,087,000        
Redemption of senior notes         350,000,000        
Evaluation of past due accounts receivable for collectability, days     180 days            
Other than temporary impairment losses     $ 0 0 0        
Estimated fair value of mortgage servicing rights     375,500,000 301,200,000          
Mortgage servicing rights, impairment charges     0 0 0        
Servicing fees from loans serviced for others     104,200,000 78,900,000 65,200,000        
Prepayment fees/late fees/ancillary income earned from loans servicing     7,200,000 8,400,000 6,100,000        
Cumulative effect adjustment to accumulated earnings     1,681,000       $ 3,300,000    
Reserve for claims insurance programs     80,600,000 73,800,000          
Reserve for claims insurance programs, current     1,700,000 1,900,000          
Operating, administrative and other expenses [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Business promotion and advertising costs     $ 65,800,000 $ 62,700,000 55,600,000        
5.25% Senior Notes [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Aggregate principal amount issued   $ 125,000,000     $ 426,875,000        
Aggregate principal amount issued   $ 125,000,000           $ 300,000,000  
Debt instrument, maturity date     Mar. 15, 2025            
Interest rate   5.25% 5.25% 5.25% 5.25%     5.25%  
6.625% senior notes [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Financing costs incurred         $ 4,700,000        
Write-off of financing costs on extinguished debt         $ 5,700,000        
Aggregate principal amount issued                 $ 350,000,000
Interest rate     6.625%   6.625%        
Redemption of senior notes         $ 350,000,000        
Debt instrument, early extinguishment premium         $ 17,400,000        
2015 Credit Agreement [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Financing costs incurred       $ 21,700,000   $ 5,400,000      
Amounts available to borrow under Credit Agreement     $ 2,800,000,000            
Financing expenses       1,000,000          
Write-off of financing costs on extinguished debt       1,700,000          
2015 Credit Agreement [Member] | Tranche A term loan facility [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Amounts available to borrow under Credit Agreement     $ 500,000,000 500,000,000          
2015 Credit Agreement [Member] | Revolving credit facility [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Amounts available to borrow under Credit Agreement       2,600,000,000          
2015 Credit Agreement [Member] | New Tranche B-1 and Tranche B-2 Term Loan Facilities [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Aggregate principal amount issued $ 400,000,000     $ 400,000,000          
Aggregate principal amount issued $ 400,000,000                
Maximum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Estimated useful lives     10            
Internal computer software [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Capitalized and amortized period     3 years            
Enterprise software development platforms [Member] | Minimum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Capitalized and amortized period     3 years            
Enterprise software development platforms [Member] | Maximum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Capitalized and amortized period     7 years            
Goodwill and Other intangible assets [Member] | Maximum [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Finite-lived intangible assets, maximum useful life     20 years