Summary of Significant Accounting Policies (Details 2) (Minimum)	12 Months Ended
Dec. 31, 2011 Y
Minimum
Period for receivables to be collected which are not significant (in years)	1

Represents the period beyond which the receivables to be collected related to contracts accounted for under the percentage of completion method, are not significant.

No definition available.

Name:	spw_PeriodForReceivablesToBeCollected
Namespace Prefix:	spw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration