ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details 2) - Guinea concession $ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($) m	Dec. 31, 2012 USD ($)	Dec. 30, 2012
Status of our Business
Ownership interest (as a percent)	37.00%	37.00%	77.00%
Minimum depth to be seabed	2,500
Tullow Guinea Ltd
Status of our Business
Ownership interest sold (as a percent)		40.00%
Threshold gross expenditure cap for well to be paid by the entity | $	$ 100	$ 100
Dana
Status of our Business
Ownership interest (as a percent)	23.00%
Tullow Guinea Ltd
Status of our Business
Ownership interest (as a percent)	40.00%