DEBT OBLIGATIONS - Narrative (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 30, 2015
Debt Instrument [Line Items]
Face amount of debt	$ 5,338,807,000us-gaap_DebtInstrumentFaceAmount
Percent decline in equity, first period	50.00%
Decline in equity, first period	12 months
Percent decline in equity, second period	35.00%
Decline in equity, second period	3 months
Ratio of indebtedness to tangible net worth	4
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Margin exposure on repurchase agreements	2,300,000,000
March 2015 Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity	1,000,000,000.0	500,000,000.0
Servicer Advance Note [Member]
Debt Instrument [Line Items]
Face amount of debt	800,000,000.0	650,000,000.0
Interest rate	2.50%
Credit Suisse First Boston Mortgage Capital, LLC [Member] \| Secured Corporate Loan [Member]
Debt Instrument [Line Items]
Face amount of debt	$ 100,000,000.0
Variable interest rate spread	3.75%

Debt Instrument, Covenant Compliance, Ratio of Indebtedness to Net Capital

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- Definition

Debt Instrument, Covenant Compliance, Reduction in Equity, Contingency One, Percent

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant Compliance, Reduction in Equity, Contingency One, Period

+ References

No definition available.

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- Definition

Debt Instrument, Covenant Compliance, Reduction in Equity, Contingency Two, Percent

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Covenant Compliance, Reduction in Equity, Contingency Two, Period

+ References

No definition available.

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- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22(a)(1))

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

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- Details

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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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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