DEBT AND OTHER OBLIGATIONS - Amount of Collateral Pledged for Repurchase Agreements, Grouped by Asset Class (Details) - Successor $ in Thousands	Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	$ 728,096
Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	728,096
Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
U.S. Treasury and agency securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	65,550
U.S. Treasury and agency securities | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	65,550
U.S. Treasury and agency securities | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
U.S. Treasury and agency securities | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
U.S. Treasury and agency securities | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
State and municipal securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
State and municipal securities | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
State and municipal securities | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
State and municipal securities | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
State and municipal securities | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Other asset-backed securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Other asset-backed securities | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Other asset-backed securities | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Other asset-backed securities | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Other asset-backed securities | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Corporate securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Corporate securities | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Corporate securities | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Corporate securities | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Corporate securities | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Equity securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Equity securities | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Equity securities | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Equity securities | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Equity securities | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Non-U.S. sovereign debt
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Non-U.S. sovereign debt | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Non-U.S. sovereign debt | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Non-U.S. sovereign debt | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Non-U.S. sovereign debt | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Mortgage loans
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	662,546
Mortgage loans | Overnight and Continuous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	662,546
Mortgage loans | Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Mortgage loans | 30-90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Mortgage loans | Greater Than 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	$ 0