Acquisitions - Estimated Purchase Price Allocation of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Goodwill	$ 654,565	$ 580,378
Reverse Mortgage Solutions, Inc. [Member] \| Originally Reported [Member]
Assets
Cash	19,683
Restricted cash	1,401
Residential loans	5,331,989
Receivables	11,832
Servicer and protective advances	17,615
Servicing rights	15,916
Goodwill	101,199
Intangible assets	20,800
Premises and equipment	15,633
Deferred tax asset, net	19,052
Other assets	13,245
Total assets acquired	5,568,365
Liabilities
Payables and accrued liabilities	29,357
Debt	148,431
HMBS related obligations	5,254,231
Total liabilities assumed	5,432,019
Fair value of net assets acquired	136,346
Reverse Mortgage Solutions, Inc. [Member] \| Measurement Period Adjustment [Member]
Assets
Cash
Restricted cash
Residential loans
Receivables
Servicer and protective advances
Servicing rights
Goodwill	24,310
Intangible assets
Premises and equipment
Deferred tax asset, net	14,489
Other assets
Total assets acquired	38,799
Liabilities
Payables and accrued liabilities	38,799
Debt
HMBS related obligations
Total liabilities assumed	38,799
Fair value of net assets acquired
Reverse Mortgage Solutions, Inc. [Member] \| Adjusted Preliminary [Member]
Assets
Cash	19,683
Restricted cash	1,401
Residential loans	5,331,989
Receivables	11,832
Servicer and protective advances	17,615
Servicing rights	15,916
Goodwill	125,509
Intangible assets	20,800
Premises and equipment	15,633
Deferred tax asset, net	33,541
Other assets	13,245
Total assets acquired	5,607,164
Liabilities
Payables and accrued liabilities	68,156
Debt	148,431
HMBS related obligations	5,254,231
Total liabilities assumed	5,470,818
Fair value of net assets acquired	136,346
ResCap Acquisition [Member]
Assets
Servicer and protective advances	186,200
ResCap Acquisition [Member] \| Originally Reported [Member]
Assets
Servicer and protective advances	186,241
Servicing rights	242,604
Goodwill	52,548
Intangible assets	8,000
Premises and equipment	18,102
Total assets acquired	507,495
Liabilities
Payables and accrued liabilities	20,270
Total liabilities assumed	20,270
Fair value of net assets acquired	487,225
ResCap Acquisition [Member] \| Measurement Period Adjustment [Member]
Assets
Servicer and protective advances
Servicing rights
Goodwill	(3,582)
Intangible assets
Premises and equipment
Total assets acquired	(3,582)
Liabilities
Payables and accrued liabilities	(3,582)
Total liabilities assumed	(3,582)
Fair value of net assets acquired
ResCap Acquisition [Member] \| Adjusted Preliminary [Member]
Assets
Servicer and protective advances	186,241
Servicing rights	242,604
Goodwill	48,966
Intangible assets	8,000
Premises and equipment	18,102
Total assets acquired	503,913
Liabilities
Payables and accrued liabilities	16,688
Total liabilities assumed	16,688
Fair value of net assets acquired	487,225
Ally Bank Net Assets [Member]
Assets
Goodwill	99
Intangible assets	1,200
Premises and equipment	201
Total assets acquired	1,500
Liabilities
Payables and accrued liabilities	1,437
Total liabilities assumed	1,437
Fair value of net assets acquired	$ 63

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

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Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of financial assets (as defined) recognized as of the acquisition date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Business combination recognized identifiable assets acquired and liabilities assumed servicing rights.

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