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Commitments, Contingent Liabilities and Other Matters - Executive Agreements (Details) - Executive officers | 12 Months Ended
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Dec. 31, 2017 employee
Executive Agreements |
Period of rolling term of employment agreements | 1 year
Number of executive officers with severance benefit agreements | 6

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- References No definition available. + Details
Name: | spxc_ExecutiveAgreementsAbstract
Namespace Prefix: | spxc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of rolling term of employment agreements. + References No definition available. + Details
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Namespace Prefix: | spxc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Supplemental Unemployment Benefits, Number of Individuals with Severance Benefit Agreements + References No definition available. + Details
Name: | spxc_SupplementalUnemploymentBenefitsNumberofIndividualswithSeveranceBenefitAgreements
Namespace Prefix: | spxc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |