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Employee Benefit Plans (Details 7) (IAM National Pension Fund, National Pension Plan, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
IAM National Pension Fund, National Pension Plan |  |
Multiemployer Benefit Plans |  |
Contributions | $ 0.3 | $ 0.3
Maximum contribution to multiemployer plan | 5.00% | 5.00%
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
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Balance Type: | na
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- Details
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Namespace Prefix: | spw_
Data Type: | xbrli:stringItemType
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
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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
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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
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Namespace Prefix: | spw_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions made to multiemployer plans for each period for which a statement of income is presented. An employer may disclose total contributions to multiemployer plans without disaggregating the amounts attributable to pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 80 -Topic 715 -URI http://asc.fasb.org/extlink&oid=6958064&loc=d3e29142-114947 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration