SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS - UNAUDITED - Net Costs Incurred on Unevaluated Properties (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Extractive Industries [Abstract]
Acquisition costs	$ (71,378)	$ (115,767)	$ (42,384)
Exploration costs	(21,579)	(16,315)	(186,308)
Capitalized interest	26,634	41,339	45,722
Total costs incurred during the year, net of divestitures	$ (66,323)	$ (90,743)	$ (182,970)

The portion of capitalized costs of identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves (including costs of drilling exploratory wells and exploratory-type stratigraphic test wells), that was previously unevaluated, but is evaluated during the current reporting period.

No definition available.

Name:	sgy_ExplorationCostsEvaluatedDuringYear
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration