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Employee Benefit Plans (Details 7) (IAM, USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
IAM |  |
Multiemployer Benefit Plans |  |
Contributions | $ 0.1 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = spw_IAMNationalPensionFundMember | $ 0.4 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = spw_IAMNationalPensionFundMember
Maximum contribution to multiemployer plan (as percent) | 5.00%spw_MultiemployerPlanPeriodContributionsMaximumPercentage / us-gaap_MultiemployerPlanNameAxis = spw_IAMNationalPensionFundMember | 5.00%spw_MultiemployerPlanPeriodContributionsMaximumPercentage / us-gaap_MultiemployerPlanNameAxis = spw_IAMNationalPensionFundMember
Amortization period of investment losses | 29 years |
Required amortization period of investment losses | 15 years |
Current period to recognize investment losses due to the updating of the current asset valuation method | 10 years |
Previous period to recognize investment losses due to the updating of the current asset valuation method | 5 years |

X
- Definition Represents the current period to recognize investment losses incurred during the 2008 plan year due to the updating of the current asset valuation method. + References No definition available. + Details
Name: | spw_CurrentPeriodOverWhichInvestmentLossesAreRecognizedDueToUpdatingOfCurrentAssetsValuationMethod
Namespace Prefix: | spw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for amortization of investment losses incurred during the 2008 plan year. + References No definition available. + Details
Name: | spw_MultiemployerPlanInvestmentLossesAmortizedPeriod
Namespace Prefix: | spw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the previously required period for amortization of investment losses incurred during the 2008 plan year. + References No definition available. + Details
Name: | spw_MultiemployerPlanLossAmortizedPeriodRequired
Namespace Prefix: | spw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of total employer contributions made to the plan that the entities contributions does not exceed. + References No definition available. + Details
Name: | spw_MultiemployerPlanPeriodContributionsMaximumPercentage
Namespace Prefix: | spw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the previous period to recognize investment losses incurred during the 2008 plan year due to the updating of the current asset valuation method. + References No definition available. + Details
Name: | spw_PreviousPeriodOverWhichInvestmentLossesAreRecognizedDueToUpdatingOfCurrentAssetsValuationMethod
Namespace Prefix: | spw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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