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CONTINGENT LIABILITIES AND OTHER MATTERS (Details 3) (Consortium arrangements, Thermal Equipment and Services reportable segment, USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 30, 2013 | Dec. 31, 2012
Consortium arrangements | Thermal Equipment and Services reportable segment |  |
Collaborative Arrangements |  |
Entity's share of the aggregate contract value on open consortium arrangements | $ 257.3 | $ 264.4
Percentage of entity's share of the aggregate contract value, recognized as revenue | 64.00% | 62.00%
Aggregate contract value on open consortium arrangements | 721.7 | 740.9
Estimated fair value of potential obligation recorded as a liabilities | $ 1.5 | $ 1.5

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