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Acquisitions, Discontinued Operations and Formation of Shanghai Electric JV (Details 2) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 USD ($) | Sep. 27, 2014 USD ($) | Jun. 28, 2014 USD ($) | Mar. 29, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 28, 2013 USD ($) | Jun. 29, 2013 USD ($) | Mar. 30, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 30, 2011 Shanghai Electric JV | Dec. 31, 2014 Fenn USD ($) | Dec. 31, 2014 Precision Components USD ($) | Dec. 31, 2014 TPS USD ($) | Sep. 27, 2014 TPS USD ($) | Jun. 28, 2014 TPS USD ($) | Mar. 29, 2014 TPS USD ($) | Dec. 31, 2014 TPS USD ($) | Dec. 31, 2013 Dielectric USD ($) | Dec. 31, 2013 Dielectric Maximum USD ($) | Dec. 31, 2013 Kayex USD ($) | Dec. 31, 2012 Tianyu USD ($) | Dec. 31, 2012 Tianyu CNY | Dec. 31, 2014 Weil McLain Shandong USD ($) | Dec. 31, 2013 Weil McLain Shandong USD ($) | Dec. 31, 2012 Weil McLain Shandong USD ($) | Dec. 31, 2014 SPX Service Solutions ("Service Solutions") USD ($) | Dec. 31, 2013 SPX Service Solutions ("Service Solutions") USD ($) | Dec. 31, 2012 SPX Service Solutions ("Service Solutions") USD ($) | Dec. 31, 2014 Other businesses sold prior to the earliest date presented in the financial statements USD ($) | Dec. 31, 2013 Other businesses sold prior to the earliest date presented in the financial statements USD ($) | Dec. 31, 2012 Other businesses sold prior to the earliest date presented in the financial statements USD ($) | Dec. 30, 2011 Certain assets of dry cooling products business Shanghai Electric JV CNY | Dec. 31, 2012 Certain assets of dry cooling products business Shanghai Electric JV CNY | Jan. 31, 2012 Certain assets of dry cooling products business Shanghai Electric JV CNY | Mar. 31, 2012 Certain assets of dry cooling products business Shanghai Electric JV USD ($) | Dec. 31, 2013 Certain assets of dry cooling products business Shanghai Electric JV CNY
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, exclusive of cash transferred |  |  |  |  |  |  |  |  | $ 108,600,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | $ 13,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | $ 1,133,400,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested |  | $ 3,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_FennLlcMember | $ 62,600,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_SPXPrecisionComponentsBusinessMember |  |  |  | $ 42,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | $ 42,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | $ 4,700,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_BroadcastAntennaSystemBusinessDielectricMember |  |  |  | 1 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_TPSTianyuEquipmentCoLtdMember |  |  | $ 2,700,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_WeilMcLainShandongCastIronBoilerCoLtdMember |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of business, net of tax |  |  |  |  |  |  |  |  | 13,300,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (4,000,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 313,400,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | (400,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_FennLlcMember | (6,900,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_SPXPrecisionComponentsBusinessMember | 200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 21,500,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 21,700,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember |  | 100,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_BroadcastAntennaSystemBusinessDielectricMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1,300,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_CrystalGrowingBusinessMember | (1,800,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_TPSTianyuEquipmentCoLtdMember |  |  |  | 2,200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_WeilMcLainShandongCastIronBoilerCoLtdMember |  |  | 313,400,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ServiceSolutionsBusinessMember |  |  |  |  |  |  |  |
Cash consideration, gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_CrystalGrowingBusinessMember |  |  |  |  |  |  |  | 1,134,900,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ServiceSolutionsBusinessMember |  |  |  | 96,700,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_DryCoolingProductsBusinessMember / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember | 25,800,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_DryCoolingProductsBusinessMember / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember | 51,500,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_DryCoolingProductsBusinessMember / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember |  | 19,400,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_DryCoolingProductsBusinessMember / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember
Cash transferred with discontinued business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 us-gaap_CashDivestedFromDeconsolidation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_TPSTianyuEquipmentCoLtdMember |  |  |  | 3,100,000 us-gaap_CashDivestedFromDeconsolidation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_WeilMcLainShandongCastIronBoilerCoLtdMember |  |  |  |  |  |  |  |  |  |  |
Adjustment to gain or loss on sale of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,100,000)us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_WeilMcLainShandongCastIronBoilerCoLtdMember | (400,000)us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_WeilMcLainShandongCastIronBoilerCoLtdMember |  | 2,100,000 us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ServiceSolutionsBusinessMember | (300,000)us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ServiceSolutionsBusinessMember |  | (2,100,000)us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_IndividuallyImmaterialDisposalGroupsIncludingDiscontinuedOperationsMember | (4,600,000)us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_IndividuallyImmaterialDisposalGroupsIncludingDiscontinuedOperationsMember | (400,000)us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_IndividuallyImmaterialDisposalGroupsIncludingDiscontinuedOperationsMember |  |  |  |  |
Working capital settlement |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 spw_DiscontinuedOperationEntityWorkingCapitalSettlement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_SPXPrecisionComponentsBusinessMember |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 spw_DiscontinuedOperationEntityWorkingCapitalSettlement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_WeilMcLainShandongCastIronBoilerCoLtdMember |  |  | 800,000 spw_DiscontinuedOperationEntityWorkingCapitalSettlement / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ServiceSolutionsBusinessMember |  |  |  |  |  |  |  |  |
Income from discontinued operations and related income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations |  |  |  |  |  |  |  |  | 22,100,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 3,600,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 612,700,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax provision |  |  |  |  |  |  |  |  | (13,800,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (2,300,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | (264,300,000)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of tax | (3,200,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (2,900,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (6,700,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 21,100,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,800,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,900,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 3,700,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (6,100,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 8,300,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,300,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 348,400,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of operations for discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 27,700,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 148,900,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 1,030,600,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) |  |  |  |  |  |  |  |  | (6,100,000)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax | 7,000,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax | 57,100,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  | 19,100,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |  |  |  |  | 19,100,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories, net |  |  |  |  | 33,900,000 us-gaap_InventoriesPropertyHeldForSaleCurrent |  |  |  |  | 33,900,000 us-gaap_InventoriesPropertyHeldForSaleCurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  |  |  |  | 1,100,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |  |  |  |  | 1,100,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  | 12,100,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |  |  |  |  | 12,100,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and intangibles, net |  |  |  |  | 34,700,000 spw_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetsNet |  |  |  |  | 34,700,000 spw_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetsNet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets of discontinued operations |  |  |  |  | 100,900,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  |  | 100,900,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  | 10,400,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |  |  |  |  | 10,400,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  | 17,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |  |  |  |  | 17,000,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities of discontinued operations |  |  |  |  | 27,400,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |  |  |  | 27,400,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in joint venture (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain associated with deconsolidation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,500,000 us-gaap_DeconsolidationGainOrLossAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_DryCoolingProductsBusinessMember / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember |

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