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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 |  |  |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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