Use Of Estimates (Details 2)	12 Months Ended
Dec. 31, 2012
Employee Benefit Plans
Amortization period of plan assets	5 years

For defined benefit plans, this element represents the amortization period of plan assets.

No definition available.

Name:	spw_DefinedBenefitPlanAmortizationPeriodOfPlantAssets
Namespace Prefix:	spw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration