New Accounting Pronouncements (Details)	12 Months Ended
Dec. 31, 2011
New Accounting Pronouncements
Minimum percentage of employers contribution for disclosure	5.00%
First level of multiemployer pension plan funding status required for disclosure (as a percent)	65.00%
Second level of multiemployer pension plan funding status required for disclosure (as a percent)	80.00%

Represents the second level of the multiemployer pension plan funding status required for disclosure.

No definition available.

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