DEBT OBLIGATIONS - Narrative (Details)				1 Months Ended		6 Months Ended
		May 09, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)
Debt Instrument [Line Items]
Face amount of debt				$ 12,944,157,000		$ 12,944,157,000
Percent decline in equity, first period				50.00%		50.00%
Decline in equity, first period (in months)						12 months
Percent decline in equity, second period				35.00%		35.00%
Decline in equity, second period (in months)						3 months
Ratio of indebtedness to tangible net worth				4		4
Unamortized Deferred Financing Costs [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 100,000
Two Year Servicer Advance Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 185,000,000
Debt instrument, term (in years)		2 years
Advance Financing Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 950,000,000
Repurchase Agreements [Member] | Total Repurchase Agreements [Member]
Debt Instrument [Line Items]
Face amount of debt	[1]			$ 4,627,431,000		$ 4,627,431,000
Secured Debt [Member] | 4.75% Senior Notes Maturing April 2018 [Member]
Debt Instrument [Line Items]
Face amount of debt					$ 225,000,000.0
Secured Debt [Member] | 4.75% Senior Notes Maturing June 2019 [Member]
Debt Instrument [Line Items]
Face amount of debt				101,200,000.0		101,200,000.0
Maximum borrowing capacity				300,000,000.0		300,000,000.0
Secured Debt [Member] | Term Loans Maturing June 2019 [Member]
Debt Instrument [Line Items]
Face amount of debt				400,000,000		400,000,000
Face amount, amount voluntarily retained				$ 20,900,000.0		$ 20,900,000.0
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] | 4.75% Senior Notes Maturing April 2018 [Member]
Debt Instrument [Line Items]
Variable interest rate spread					4.75%
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] | 4.75% Senior Notes Maturing June 2019 [Member]
Debt Instrument [Line Items]
Variable interest rate spread				4.75%

[1] These repurchase agreements had approximately $8.5 million of associated accrued interest payable as of June 30, 2016.