Commitments, Contingent Liabilities and Other Matters (Details 3) (Site investigation and remediation)	Dec. 31, 2012 site	Dec. 31, 2011 site
Site investigation and remediation
Environmental Matters
Number of sites	95	92
Number of third-party disposal sites for which entity is potentially responsible	23	28
Number of active sites	6	12

Represents the number of offsite, third-party disposal sites for which the entity is potentially responsible and have received notices of potential liability pursuant to various environmental laws.

No definition available.

Name:	spw_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible
Namespace Prefix:	spw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant