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Summary of Significant Accounting Policies (Details 2) (Domestic qualified pension plan, Historical method)	12 Months Ended
	Dec. 31, 2013
Domestic qualified pension plan | Historical method
Pension and Postretirement
Amortization period of plan assets	5 years

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration