TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES - Additional Information (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Related Party Transaction [Line Items]
Management agreement, renewal term (in years)	1 year
Termination fee, number of months' pay (in months)	12 months
Proportion of directors' votes needed to terminate	0.6667
Accruals for MSR Fund Payments	$ 0.3
Amount of securities transferred to MSR Fund Payments	$ 0.7
Nationstar \| Credit Concentration Risk \| Investment Interest Income - Excess MSRs
Related Party Transaction [Line Items]
Percentage of UPB of loans underlying investments	66.70%
Nationstar \| Credit Concentration Risk \| Investment Interest Income - MSRs
Related Party Transaction [Line Items]
Percentage of UPB of loans underlying investments	27.60%
Nationstar \| Credit Concentration Risk \| Investment Interest Income - Servicer Advances
Related Party Transaction [Line Items]
Percentage of UPB of loans underlying investments	35.60%
Manager
Related Party Transaction [Line Items]
Management fee rate (percent)	1.50%
Incentive compensation percentage	25.00%
Interest rate for incentive compensation	10.00%
Nationstar \| Residential Mortgage
Related Party Transaction [Line Items]
Unpaid Principal Balance	$ 954.8
Nationstar \| Real Estate Owned
Related Party Transaction [Line Items]
Unpaid balance of real estate owned	20.2
Nationstar \| Non-Agency
Related Party Transaction [Line Items]
Face amount of investment	3,200.0
Unpaid Principal Balance	$ 18,500.0
Redemption premium percentage	0.75%
Nationstar \| Agency RMBS
Related Party Transaction [Line Items]
Face amount of investment	$ 24.2

Debt Instrument, Redemption Price Premium, Percentage

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Per the management agreement with the Manager, annual incentive compensation is due for services performed. The percentage is calculated based upon the dollar amount of the company's funds from operations before incentive compensation per share of common stock plus gains (losses) from debt restructuring and gains (losses) from sales of property and other assets per share of common stock given that this amount exceeds the weighted average of the book value per share of the equity transferred by Newcastle on the distribution date and the prices per share of the company's common stock in any offerings multiplied by a simple interest rate of 10% per annum multiplied by the weighted average number of shares of common stock outstanding.

+ References

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The simple interest rate used in the calculation for annual incentive compensation due to the manager.

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- Definition

Management Agreement, Renewal Term

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The fee rate percent charged for management of investments.

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Mortgage Servicing Rights, Amount Transferred to Accrued Funds

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Mortgage Servicing Rights, Payments And Accruals

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Related Party, Proportion of Directors' Votes Needed to Terminate

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Related Party, Termination Fee Period

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- Definition

Unpaid Balance of Real Estate Owned

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- Definition

The unpaid principal balance of underlying loans.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Nominal or face amount on the investment owned.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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