Four Zero One K - Additional Information (Detail)	6 Months Ended
Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Annual contribution of employee compensation	60.00%
Percentage of discretionary match of the first 6% of employee contributions	50.00%
Percentage of employee contribution matched by employer	6.00%

Employer Percentage Match Contribution of Eligible Compensation up to Maximum Annual Contribution

No definition available.

Name:	engy_EmployerPercentageMatchContributionOfEligibleCompensationUpToMaximumAnnualContribution
Namespace Prefix:	engy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration