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Commitments, Contingent Liabilities and Other Matters (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Board Of Directors |  |
Executive Agreements |  |
Number of executives for whom employment agreements is approved | 6 spw_NumberOfEmployeesApprovedForEmploymentAgreements / us-gaap_TitleOfIndividualAxis = spw_BoardOfDirectorsMember |
Number of officers having outstanding non-interest bearing relocation home loans | 1 spw_NumberOfOfficersWithOutstandingNonInterestBearingRelocationHomeLoans / us-gaap_TitleOfIndividualAxis = spw_BoardOfDirectorsMember |
Repayment tenure of non-interest bearing relocation home loans | 20 years |
Amount of relocation home loans | $ 1.5 spw_AmountOfRelocationHomeLoans / us-gaap_TitleOfIndividualAxis = spw_BoardOfDirectorsMember |
Number of executives having change of control agreements | 10 spw_TotalNumberOfExecutivesHavingChangeInControlAgreements / us-gaap_TitleOfIndividualAxis = spw_BoardOfDirectorsMember |
Board Of Directors | Minimum |  |
Executive Agreements |  |
Period of rolling term of employment agreements | 1 year |
Board Of Directors | Maximum |  |
Executive Agreements |  |
Period of rolling term of employment agreements | 2 years |
Consortium arrangements | Thermal Equipment and Services reportable segment |  |
Collaborative Arrangements |  |
Entity's share of the aggregate contract value on open consortium arrangements | 65.2 spw_CollaborativeArrangementsContractValue / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 139.3 spw_CollaborativeArrangementsContractValue / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Percentage of entity's share of the aggregate contract value, recognized as revenue | 87.00%spw_CollaborativeArrangementsPercentageOfRevenueRecognized / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 87.00%spw_CollaborativeArrangementsPercentageOfRevenueRecognized / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Aggregate contract value on open consortium arrangements | 291.1 spw_CollaborativeArrangementsAggregateContractValue / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 433.8 spw_CollaborativeArrangementsAggregateContractValue / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember
Estimated fair value of potential obligation recorded as a liabilities | $ 0.7 spw_CollaborativeArrangementsEstimatedFairValueOfPotentialObligation / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | $ 1.7 spw_CollaborativeArrangementsEstimatedFairValueOfPotentialObligation / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember

X
- Definition Represents the total amount granted for relocation home loans in connection with the 2001 moving of corporate headquarters. + References No definition available. + Details
Name: | spw_AmountOfRelocationHomeLoans
Namespace Prefix: | spw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the aggregate contract value on open consortium arrangements. + References No definition available. + Details
Name: | spw_CollaborativeArrangementsAggregateContractValue
Namespace Prefix: | spw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the entity's share of aggregate contract value on open consortium arrangements. + References No definition available. + Details
Name: | spw_CollaborativeArrangementsContractValue
Namespace Prefix: | spw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the estimated fair value of potential obligation under the joint and several liability provisions associated with consortium arrangements, recorded as a liability. + References No definition available. + Details
Name: | spw_CollaborativeArrangementsEstimatedFairValueOfPotentialObligation
Namespace Prefix: | spw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the percentage of entity's share of aggregate contract value which had been recognized as revenue. + References No definition available. + Details
Name: | spw_CollaborativeArrangementsPercentageOfRevenueRecognized
Namespace Prefix: | spw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | spw_ExecutiveAgreementsAbstract
Namespace Prefix: | spw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of executives with employment contracts as approved by the Board of Directors. + References No definition available. + Details
Name: | spw_NumberOfEmployeesApprovedForEmploymentAgreements
Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of executive officers having outstanding non-interest bearing relocation home loans. + References No definition available. + Details
Name: | spw_NumberOfOfficersWithOutstandingNonInterestBearingRelocationHomeLoans
Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of rolling term of employment agreements. + References No definition available. + Details
Name: | spw_PeriodOfRollingTermOfEmploymentAgreements
Namespace Prefix: | spw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for repayment of non-interest bearing relocation home loans. + References No definition available. + Details
Name: | spw_RepaymentTenureOfNonInterestBearingRelocationHomeLoans
Namespace Prefix: | spw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of executives having change of control agreements. + References No definition available. + Details
Name: | spw_TotalNumberOfExecutivesHavingChangeInControlAgreements
Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=spw_BoardOfDirectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |