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COMMITMENTS AND CONTINGENCIES (Details) | Mar. 31, 2015
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Commitments and Contingencies [Line Items] |
Number Of Former Manufactured Gas Sites Where We Own Or Retain Legal Responsibility For Environmental Conditions | 12 ogs_NumberOfFormerManufacturedGasSitesWhereWeOwnOrRetainLegalResponsibilityForEnvironmentalConditions
Number of sites where we have completed or addressed removal of the source of soil contamination according to plans approved by KDHE | 11 ogs_NumberofsiteswherewehavecompletedoraddressedremovalofthesourceofsoilcontaminationaccordingtoplansapprovedbyKDHE.
Number of sites where regulatory closure has been achieved | 3 ogs_NumberOfSitesWhereRegulatoryClosureHasBeenAchieved
Percentage yield of high consequence pipeline areas | 30.00%ogs_Percentageyieldofhighconsequencepipelineareas

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- Details
Name: | ogs_CommitmentsandContingenciesLineItems
Namespace Prefix: | ogs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of former manufactured gas sites where we own or retain legal responsibility. + References No definition available. + Details
Name: | ogs_NumberOfFormerManufacturedGasSitesWhereWeOwnOrRetainLegalResponsibilityForEnvironmentalConditions
Namespace Prefix: | ogs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of sites where regulatory closure has been achieved + References No definition available. + Details
Name: | ogs_NumberOfSitesWhereRegulatoryClosureHasBeenAchieved
Namespace Prefix: | ogs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of sites where we have completed or addressed removal of the source of soil contamination according to plans approved by KDHE. + References No definition available. + Details
Name: | ogs_NumberofsiteswherewehavecompletedoraddressedremovalofthesourceofsoilcontaminationaccordingtoplansapprovedbyKDHE.
Namespace Prefix: | ogs_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Minimum percentage yield required to test pipelines previously untested in high-consequence areas. + References No definition available. + Details
Name: | ogs_Percentageyieldofhighconsequencepipelineareas
Namespace Prefix: | ogs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant