Investment in Oil and Gas Properties - Unaudited - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013 Project	Dec. 31, 2012	Dec. 31, 2011
Extractive Industries [Abstract]
Interest costs capitalized on unevaluated properties	$ 46,860	$ 37,656	$ 42,033
Specifically identified drilling projects	140
Projects expected to be evaluated	4 years

Interest costs capitalized on unevaluated properties.

No definition available.

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