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Commitments, Contingent Liabilities and Other Matters (Details 3) (Site investigation and remediation) | Dec. 31, 2014 site | Dec. 31, 2013 site
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Site investigation and remediation |  |
Environmental Matters |  |
Number of sites | 91 spw_SiteContingencyNumberOfSites / us-gaap_EnvironmentalRemediationContingencyAxis = us-gaap_EnvironmentalIssueMember | 94 spw_SiteContingencyNumberOfSites / us-gaap_EnvironmentalRemediationContingencyAxis = us-gaap_EnvironmentalIssueMember
Number of third-party disposal sites for which entity is potentially responsible | 28 spw_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible / us-gaap_EnvironmentalRemediationContingencyAxis = us-gaap_EnvironmentalIssueMember | 23 spw_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible / us-gaap_EnvironmentalRemediationContingencyAxis = us-gaap_EnvironmentalIssueMember
Number of active sites | 9 spw_SiteContingencyNumberOfActiveSites / us-gaap_EnvironmentalRemediationContingencyAxis = us-gaap_EnvironmentalIssueMember | 6 spw_SiteContingencyNumberOfActiveSites / us-gaap_EnvironmentalRemediationContingencyAxis = us-gaap_EnvironmentalIssueMember

X
- Definition Represents the number of offsite, third-party disposal sites which have been active in the past few years. + References No definition available. + Details
Name: | spw_SiteContingencyNumberOfActiveSites
Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of sites which have liabilities for site investigation and remediation. + References No definition available. + Details
Name: | spw_SiteContingencyNumberOfSites
Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | spw_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible
Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SiteContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration