Use Of Estimates (Details 2)	12 Months Ended
Dec. 31, 2011 Y
Employee Benefit Plans
Amortization period of plan assets	5
Minimum
Income Taxes
The percentage used to determine whether a benefit is more likely than not to be sustained upon examination	50.00%

The percentage used to determine whether a benefit is more likely than not to be sustained upon examination.

No definition available.

Name:	spw_ProbabilityOfTaxBenefitsRealizedOnUltimateSettlement
Namespace Prefix:	spw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration