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
Number of officers having outstanding non-interest bearing relocation home loans	1
Repayment tenure of non-interest bearing relocation home loans	20 years
Amount of relocation home loans	$ 1.5
Number of executives having change of control agreements	10
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	139.3
Percentage of entity's share of the aggregate contract value, recognized as revenue	87.00%	87.00%
Aggregate contract value on open consortium arrangements	291.1	433.8
Estimated fair value of potential obligation recorded as a liabilities	$ 0.7	$ 1.7

- 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

- 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

- 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

- 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

- 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

- Details

Name:	spw_ExecutiveAgreementsAbstract
Namespace Prefix:	spw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

- 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

- 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

- 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

- Details

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

- Details

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

- Details

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