Fair Value - Fair Value and Unpaid Principal Balance of Assets and Liabilities Carried Under Fair Value Option (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Apr. 30, 2014	Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans at fair value	$ 11,268,401		$ 10,341,375
Receivables related to Non-Residual Trusts	36,181		43,545
Assets, Fair Value	11,304,582		10,384,920
Mortgage-backed debt at fair value	651,784		684,778
HMBS related obligations at fair value	9,472,666		8,652,746
Liabilities, Fair Value	10,124,450		9,337,524
Receivables, net (includes $36,181 and $43,545 at fair value at June 30, 2014 and December 31, 2013, respectively)	288,829		319,195
Assets, Unpaid Principal Balance	13,845,227		9,883,799
Mortgage-backed debt related to Non-Residual Trusts	695,366		735,379
HMBS related obligations	8,646,651		7,959,711
Liabilities, Unpaid Principal Balance	9,342,017		8,695,090
Reverse Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans at fair value	9,482,030		8,738,503
Residential Loans, Unpaid Principal Balance	8,741,715		8,135,927
Forward Loans in Non-Residual Trusts [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans at fair value	557,786		587,265
Residential Loans, Unpaid Principal Balance	687,940		727,110
Charged Off Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans at fair value	54,997		0
Residential Loans, Unpaid Principal Balance	3,272,912	3,300,000	0
Forward Loans Held for Sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans at fair value	1,173,588		1,015,607
Residential Loans, Unpaid Principal Balance	1,106,136		976,774
VIE Primary Beneficiary [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Residential loans at fair value	557,786		587,265
Receivables related to Non-Residual Trusts	36,181		43,545
Mortgage-backed debt at fair value	651,784		684,778
Receivables, net (includes $36,181 and $43,545 at fair value at June 30, 2014 and December 31, 2013, respectively)	36,181		43,545
Receivables related to Non-Residual Trusts	$ 36,524		$ 43,988

Fair value portion of 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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13487-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Subparagraph a, b

-Article 5

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.9)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Glossary Loan

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Accounts receivable at fair value unpaid principal balance.

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Beneficial interest at fair value.

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Fair value option assets fair value balance.

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Fair value option liabilities fair value balance.

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Fair value option unpaid principal asset balance.

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Fair value option unpaid principal liability balance.

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Home equity conversion mortgage backed security related obligations.

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Home equity conversion mortgage backed security related obligations unpaid principal balance.

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- Definition

Loans receivable at fair value unpaid principal balance.

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