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CONTINGENT LIABILITIES AND OTHER MATTERS (Details 4) - Consortium arrangements - Thermal Equipment and Services reportable segment - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 02, 2016 | Dec. 31, 2015
Collaborative Arrangements |  |
Entity's share of the aggregate contract value on open consortium arrangements | $ 102.9 | $ 100.2
Percentage of entity's share of the aggregate contract value, recognized as revenue | 71.00% | 68.00%
Aggregate contract value on open consortium arrangements | $ 382.0 | $ 371.7
Estimated fair value of potential obligation recorded as a liabilities | $ 0.7 | $ 0.6

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- Definition Represents the aggregate contract value on open consortium arrangements. + References No definition available. + Details
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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
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Namespace Prefix: | spxc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the percentage of entity's share of aggregate contract value which had been recognized as revenue. + References No definition available. + Details
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Namespace Prefix: | spxc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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Data Type: | xbrli:stringItemType
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- 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: |