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Commitments, Contingent Liabilities and Other Matters (Details 4) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) employee	Dec. 31, 2014 USD ($)
Executive officers
Executive Agreements
Period of rolling term of employment agreements	1 year
Number of executive officers with severance benefit agreements | employee	5
Number of officers having outstanding non-interest bearing relocation home loans | employee	1
Repayment tenure of non-interest bearing relocation home loans	20 years
Amount of relocation home loans	$ 1.5
Consortium arrangements | Detection and Measurement segment
Collaborative Arrangements
Entity's share of the aggregate contract value on open consortium arrangements	$ 100.2	$ 65.2
Percentage of entity's share of the aggregate contract value, recognized as revenue	68.00%	87.00%
Aggregate contract value on open consortium arrangements	$ 371.7	$ 291.1
Estimated fair value of potential obligation recorded as a liabilities	$ 0.6	$ 0.7

X

- 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:	spxc_AmountOfRelocationHomeLoans
Namespace Prefix:	spxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the aggregate contract value on open consortium arrangements.

+ References

No definition available.

+ Details

Name:	spxc_CollaborativeArrangementsAggregateContractValue
Namespace Prefix:	spxc_
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:	spxc_CollaborativeArrangementsContractValue
Namespace Prefix:	spxc_
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:	spxc_CollaborativeArrangementsEstimatedFairValueOfPotentialObligation
Namespace Prefix:	spxc_
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:	spxc_CollaborativeArrangementsPercentageOfRevenueRecognized
Namespace Prefix:	spxc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	spxc_ExecutiveAgreementsAbstract
Namespace Prefix:	spxc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of executive officers having outstanding non-interest bearing relocation home loans.

+ References

No definition available.

+ Details

Name:	spxc_NumberOfOfficersWithOutstandingNonInterestBearingRelocationHomeLoans
Namespace Prefix:	spxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period of rolling term of employment agreements.

+ References

No definition available.

+ Details

Name:	spxc_PeriodOfRollingTermOfEmploymentAgreements
Namespace Prefix:	spxc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for repayment of non-interest bearing relocation home loans.

+ References

No definition available.

+ Details

Name:	spxc_RepaymentTenureOfNonInterestBearingRelocationHomeLoans
Namespace Prefix:	spxc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=spxc_ThermalEquipmentAndServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: