SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies - Top Customers (Details)	9 Months Ended		12 Months Ended				3 Months Ended
	Dec. 31, 2012		Dec. 31, 2014		Dec. 31, 2013		Mar. 25, 2012
Successor
Entity-Wide Revenue, Major Customer, Percentage	100.00%		100.00%		100.00%
Predecessor
Entity-Wide Revenue, Major Customer, Percentage							100.00%
Phillips 66 Company [Member] | Successor
Entity-Wide Revenue, Major Customer, Percentage	28.00%	[1]	0.00%	[1]	10.00%	[1]
Phillips 66 Company [Member] | Predecessor
Entity-Wide Revenue, Major Customer, Percentage							35.00%	[1]
BG LNG Services | Successor
Entity-Wide Revenue, Major Customer, Percentage	14.00%	[2]	0.00%	[2]	22.00%	[2]
BG LNG Services | Predecessor
Entity-Wide Revenue, Major Customer, Percentage							14.00%	[2]
Ameren Corporation [Member] | Successor
Entity-Wide Revenue, Major Customer, Percentage	3.00%		11.00%		6.00%
Ameren Corporation [Member] | Predecessor
Entity-Wide Revenue, Major Customer, Percentage							4.00%
Other Top 10 Customers | Successor
Entity-Wide Revenue, Major Customer, Percentage	22.00%		40.00%		20.00%
Other Top 10 Customers | Predecessor
Entity-Wide Revenue, Major Customer, Percentage							21.00%
Remaining Customers | Successor
Entity-Wide Revenue, Major Customer, Percentage	33.00%		49.00%		42.00%
Remaining Customers | Predecessor
Entity-Wide Revenue, Major Customer, Percentage							26.00%

[1] SUGS, which was deconsolidated on April 30, 2013, had contracted to sell its entire owned or controlled output of NGL equity volumes to Phillips 66. Pricing for the NGL equity volumes sold to Phillips 66 throughout the contract period was OPIS pricing based at Mont Belvieu, Texas delivery points.

[2] BG Energy Holdings LTD is the sole customer of Lake Charles LNG, which was deconsolidated effective January 1, 2014. See Note 3.