SUBSEQUENT EVENTS (Details) (Subsequent event, ABB Ltd., USD $)	Apr. 21, 2013
Subsequent event \| ABB Ltd.
SUBSEQUENT EVENTS
Right to receive cash for each common stock	$ 6.35

Represents the right to receive cash for each common stock of the entity pursuant to business combination.

No definition available.

Name:	pwer_BusinessCombinationRightToReceiveCashForEachCommonStock
Namespace Prefix:	pwer_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant