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Commitments, Contingent Liabilities and Other Matters (Details 4) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Board Of Directors |  |
Executive Agreements |  |
Number of Board approved executive employment agreements (in executives) | 8 |
Number of officers having outstanding non-interest bearing relocation home loans | 2 |
Repayment tenure of non-interest bearing relocation home loans (in years) | 20 |
Amount of relocation home loans | $ 3.0 |
Board Of Directors | Minimum |  |
Executive Agreements |  |
Period of rolling term of employment agreements (in years) | 1 |
Board Of Directors | Maximum |  |
Executive Agreements |  |
Period of rolling term of employment agreements (in years) | 2 |
Consortium arrangements | Thermal Equipment and Services reportable segment |  |
Collaborative Arrangements |  |
Entity's share of the aggregate contract value on open consortium arrangements | 264.4 | 324.0
Percentage of entity's share of the aggregate contract value, recognized as revenue | 62.00% | 56.00%
Aggregate contract value on open consortium arrangements | 740.9 | 801.1
Estimated fair value of potential obligation recorded as a liabilities | $ 1.5 | $ 1.9

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
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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
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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
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Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
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
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Namespace Prefix: | spw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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