DEBT AND OTHER OBLIGATIONS - Non-Recourse Funding Obligations (Details) - USD ($)			8 Months Ended	9 Months Ended
	Jan. 15, 2016	Oct. 10, 2012	Sep. 30, 2015	Sep. 30, 2016	Dec. 31, 2015
Financing Agreement With Golden Gate And Syndicate Of Risk Takers
Debt Instrument [Line Items]
Term of financing agreement	18 years
Financing capacity under the agreement	$ 2,188,000,000.000
Golden Gate | Non-recourse Funding Obligations Series
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations	800,000,000
Golden Gate | Surplus Notes | Steel City Notes
Debt Instrument [Line Items]
Amount of debt issued	2,188,000,000.000
Steel City | Surplus Notes | Golden Gate Surplus Notes
Debt Instrument [Line Items]
Amount of debt issued	$ 2,188,000,000.000
Golden Gate V and Red Mountain
Debt Instrument [Line Items]
Term of transaction		20 years
Maximum financing capacity under transaction		$ 945,000,000
Red Mountain
Debt Instrument [Line Items]
Maximum financing capacity under transaction		945,000,000
Principal amount of note issued		$ 275,000,000
Successor
Debt Instrument [Line Items]
Repayment of non-recourse funding obligations			$ (50,000,000)	$ (2,098,700,000)
Non-recourse funding obligations				2,800,886,000	$ 685,684,000
Successor | Golden Gate | Steel City Notes
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations				$ 2,135,000,000
Stated interest rate (as a percent)				4.75%
Successor | Golden Gate | Non-recourse Funding Obligations Series
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations					800,000,000
Successor | Golden Gate | Series A1 Non-recourse Funding Obligation
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations					$ 400,000,000
Stated interest rate (as a percent)					7.375%
Successor | Golden Gate | Series A2 Non-recourse Funding Obligation
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations					$ 100,000,000
Stated interest rate (as a percent)					8.00%
Successor | Golden Gate | Series A3 Non-recourse Funding Obligation
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations					$ 300,000,000
Stated interest rate (as a percent)					8.45%
Successor | Golden Gate | Surplus Notes | Steel City Notes
Debt Instrument [Line Items]
Long-term Debt				$ 2,135,000,000
Successor | Golden Gate Captive Insurance Company
Debt Instrument [Line Items]
Non-recourse funding obligations				$ 2,135,000,000
Non-recourse funding obligation, year-to-date weighted-average interest rate				4.75%
Successor | Golden Gate II
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations				$ 575,000,000
Non-recourse funding obligations held by external parties				58,600,000
Non-recourse funding obligations held by affiliates				516,400,000
Payments under support agreement obligation				0
Amount of support agreement obligations collateralized				1,500,000
Repayment of non-recourse funding obligations				86,300,000.0
Non-recourse funding obligations				$ 49,958,000
Non-recourse funding obligation, year-to-date weighted-average interest rate				2.47%
Non-recourse funding obligations, outstanding principal				$ 58,600,000
Successor | Golden Gate V and Red Mountain
Debt Instrument [Line Items]
Payments under support agreement obligation				0
Successor | Red Mountain
Debt Instrument [Line Items]
Principal amount of note issued				550,000,000
Future scheduled capital contributions				134,200,000
Successor | Golden Gate V
Debt Instrument [Line Items]
Outstanding non-recourse funding obligations				$ 550,000,000
Stated interest rate (as a percent)				6.25%
Maximum financing capacity under transaction				$ 945,000,000
Non-recourse funding obligations				$ 613,447,000
Non-recourse funding obligation, year-to-date weighted-average interest rate				5.12%
Non-recourse funding obligations, outstanding principal				$ 550,000,000
Successor | MONY
Debt Instrument [Line Items]
Non-recourse funding obligations				$ 2,481,000
Non-recourse funding obligation, year-to-date weighted-average interest rate				6.19%
Non-recourse funding obligations, outstanding principal				$ 1,091,000