Financial Data Related to Oil and Gas Producing Activities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Extractive Industries [Abstract]
Asset retirement costs included in development cost	$ 54,737	$ 95,293	$ 96,386

Asset retirement costs included in development cost.

No definition available.

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