SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (Revenues,, Customer Concentration Risk)	12 Months Ended
Dec. 31, 2011
Revenues, \| Customer Concentration Risk
Revenue and Customer Receivables
Minimum percentage of revenues used to account for major customers	10.00%

Threshold percentage which the entity uses for disclosure of major customers.

No definition available.

Name:	teg_ThresholdForDisclosurePercentage
Namespace Prefix:	teg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration