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Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Sep. 03, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 21, 2016
Jan. 01, 2016
Jun. 30, 2015
Summary Of Significant Accounting Policies [Line Items]              
Cash unavailable for general corporate use   $ 123,800,000 $ 73,300,000        
Restricted cash   $ 73,045,000 $ 68,836,000        
Amortization period of financing costs, maximum   10 years 10 years        
Total deferred financing costs, net of accumulated amortization   $ 23,000,000 $ 22,200,000        
Aggregate principal amount issued       $ 595,440,000      
Financing expenses   $ 10,783,000 10,935,000 12,311,000      
Write-off of financing costs on extinguished debt       2,685,000      
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   446,300,000 375,500,000        
Mortgage servicing rights, impairment charges   0 0 0      
Servicing fees from loans serviced for others   144,200,000 115,300,000 92,000,000      
Prepayment fees/late fees/ancillary income earned from loans servicing   13,200,000 7,200,000 8,400,000      
Cumulative effect adjustment to accumulated earnings     1,681,000     $ 3,300,000  
Reserve for claims insurance programs   93,700,000 80,600,000        
Reserve for claims insurance programs, current   2,800,000 1,700,000        
Operating, administrative and other expenses [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Business promotion and advertising costs   63,100,000 65,800,000 62,700,000      
2015 Credit Agreement [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Amounts available to borrow under Credit Agreement   2,800,000,000          
Financing costs, incurred   8,000,000   21,700,000 $ 5,400,000    
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   750,000,000   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   $ 2,800,000,000   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      
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] | Revenue [Member] | Accounting Standards Update 2014-09 | Third-party Costs [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Additional revenue and costs of services from third-party costs   $ 5,000,000,000 5,000,000,000        
Maximum [Member] | Cost of services [Member] | Accounting Standards Update 2014-09 | Third-party Costs [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Additional revenue and costs of services from third-party costs   $ 5,000,000,000 5,000,000,000        
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] | Revenue [Member] | Accounting Standards Update 2014-09 | Third-party Costs [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Additional revenue and costs of services from third-party costs   $ 4,000,000,000 4,000,000,000        
Minimum [Member] | Cost of services [Member] | Accounting Standards Update 2014-09 | Third-party Costs [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Additional revenue and costs of services from third-party costs   $ 4,000,000,000 $ 4,000,000,000        
Minimum [Member] | Enterprise software development platforms [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Capitalized and amortized period   3 years