INVESTMENT OPERATIONS - Summary of Change in Unrealized Gains (Losses), Net of Income Tax, on Fixed Maturity and Equity Securities, Classified as Available-for-Sale (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Jan. 31, 2015	Mar. 31, 2015	Mar. 31, 2016
Successor | Fixed maturities
Investment Holdings [Line Items]
Change in unrealized gains (losses), net of income tax		$ (343,199)	$ 632,685
Successor | Equity securities
Investment Holdings [Line Items]
Change in unrealized gains (losses), net of income tax		$ 1,511	$ (70)
Predecessor | Fixed maturities
Investment Holdings [Line Items]
Change in unrealized gains (losses), net of income tax	$ 670,229
Predecessor | Equity securities
Investment Holdings [Line Items]
Change in unrealized gains (losses), net of income tax	$ 10,226