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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 |  |  |

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