General Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reduction of oil and gas revenue	$ 0.9
Additional severance tax expense	$ 0.8

Severance tax adjustments in the current period related to prior period activity

No definition available.

Name:	sfy_SeveranceTaxAdjustmentsInCurrentPeriodRelatedToPriorPeriodActivity
Namespace Prefix:	sfy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration