DEBT AND OTHER OBLIGATIONS - Remaining Contractual Maturity of the Agreements (Details) - Successor $ in Thousands	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	$ 861,732
U.S. Treasury and agency securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	381,463
State and municipal securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Other asset-backed securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Corporate securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Equity securities
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
Mortgage loans
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	480,269
Overnight and Contiguous
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	837,974
Overnight and Contiguous | U.S. Treasury and agency securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	357,705
Overnight and Contiguous | State and municipal securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Overnight and Contiguous | Other asset-backed securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Overnight and Contiguous | Corporate securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Overnight and Contiguous | Equity securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Overnight and Contiguous | Non-U.S. sovereign debt
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Overnight and Contiguous | Mortgage loans
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	480,269
Up to 30 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	23,758
Up to 30 days | U.S. Treasury and agency securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	23,758
Up to 30 days | State and municipal securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Up to 30 days | Other asset-backed securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Up to 30 days | Corporate securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Up to 30 days | Equity securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Up to 30 days | Non-U.S. sovereign debt
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Up to 30 days | Mortgage loans
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | U.S. Treasury and agency securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | State and municipal securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | Other asset-backed securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | Corporate securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | Equity securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | Non-U.S. sovereign debt
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
30 - 90 days | Mortgage loans
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | U.S. Treasury and agency securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | State and municipal securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | Other asset-backed securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | Corporate securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | Equity securities
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | Non-U.S. sovereign debt
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	0
Greater than 90 Days | Mortgage loans
Debt Instrument [Line Items]
Collateral pledged for repurchase agreements	$ 0