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REGULATORY ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Assets, Current | $ 22,322 us-gaap_RegulatoryAssetsCurrent | $ 50,193 us-gaap_RegulatoryAssetsCurrent
Regulatory Assets, Noncurrent | 465,049 us-gaap_RegulatoryAssetsNoncurrent | 478,723 us-gaap_RegulatoryAssetsNoncurrent
Regulatory Liability, Current | (54,252)us-gaap_RegulatoryLiabilityCurrent | (32,467)us-gaap_RegulatoryLiabilityCurrent
Net regulatory assets (liabilities), current | (31,930)ogs_Netregulatoryassetsandliabilitiescurrent | 17,726 ogs_Netregulatoryassetsandliabilitiescurrent
Net regulatory assets (liabilities), noncurrent | 450,011 ogs_Netregulatoryassetsandliabilitiesnoncurrent | 463,272 ogs_Netregulatoryassetsandliabilitiesnoncurrent
Net Regulatory Assets | 418,081 us-gaap_NetRegulatoryAssets | 480,998 us-gaap_NetRegulatoryAssets
Accumulated removal costs [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Liability, Current | 0 us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember | 0 us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember
Regulatory Liability, Noncurrent | (15,038)us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember | (15,451)us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember
Regulatory Liabilities | (15,038)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember | (15,451)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember
Weather normalization [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Liability, Current | (8,740)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_WeathernormalizationMember | (16,516)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_WeathernormalizationMember
Regulatory Liability, Noncurrent | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_WeathernormalizationMember | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_WeathernormalizationMember
Regulatory Liabilities | (8,740)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_WeathernormalizationMember | (16,516)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_WeathernormalizationMember
Over-recovered purchased-gas costs [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Liability, Current | (44,015)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_OverrecoveredpurchasedgascostsMember | (13,055)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_OverrecoveredpurchasedgascostsMember
Regulatory Liability, Noncurrent | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_OverrecoveredpurchasedgascostsMember | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_OverrecoveredpurchasedgascostsMember
Regulatory Liabilities | (44,015)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_OverrecoveredpurchasedgascostsMember | (13,055)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_OverrecoveredpurchasedgascostsMember
Ad valorem tax [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Liability, Current | (1,497)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_AdvaloremtaxMember | (2,896)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_AdvaloremtaxMember
Regulatory Liability, Noncurrent | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_AdvaloremtaxMember | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_AdvaloremtaxMember
Regulatory Liabilities | (1,497)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_AdvaloremtaxMember | (2,896)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_AdvaloremtaxMember
Total regulated liabilities [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Liability, Current | (54,252)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_TotalregulatedliabilitiesMember | (32,467)us-gaap_RegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = ogs_TotalregulatedliabilitiesMember
Regulatory Liability, Noncurrent | (15,038)us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_TotalregulatedliabilitiesMember | (15,451)us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = ogs_TotalregulatedliabilitiesMember
Regulatory Liabilities | (69,290)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_TotalregulatedliabilitiesMember | (47,918)us-gaap_RegulatoryLiabilities / us-gaap_RegulatoryLiabilityAxis = ogs_TotalregulatedliabilitiesMember
Under-recovered purchased-gas costs [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Assets, Current |  | 28,712 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = ogs_UnderrecoveredpurchasedgascostsMember
Regulatory Assets, Noncurrent |  | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = ogs_UnderrecoveredpurchasedgascostsMember
Regulatory Assets |  | 28,712 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ogs_UnderrecoveredpurchasedgascostsMember
Pension and postretirement benefit costs [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Assets, Current | 20,218 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | 18,108 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember
Regulatory Assets, Noncurrent | 453,382 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | 466,684 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember
Regulatory Assets | 473,600 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember | 484,792 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_PensionCostsMember
Reacquired debt costs [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Assets, Current | 812 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember | 812 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember
Regulatory Assets, Noncurrent | 9,527 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember | 9,730 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember
Regulatory Assets | 10,339 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember | 10,542 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember
Other regulatory assets [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Assets, Current | 1,292 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = ogs_OtherregulatoryassetsMember | 2,561 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = ogs_OtherregulatoryassetsMember
Regulatory Assets, Noncurrent | 2,140 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = ogs_OtherregulatoryassetsMember | 2,309 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = ogs_OtherregulatoryassetsMember
Regulatory Assets | 3,432 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ogs_OtherregulatoryassetsMember | 4,870 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ogs_OtherregulatoryassetsMember
Total regulatory assets, net of amortization [Member] |  |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |  |
Regulatory Assets, Current | 22,322 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = ogs_TotalregulatoryassetsnetofamortizationMember | 50,193 us-gaap_RegulatoryAssetsCurrent / us-gaap_RegulatoryAssetAxis = ogs_TotalregulatoryassetsnetofamortizationMember
Regulatory Assets, Noncurrent | 465,049 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = ogs_TotalregulatoryassetsnetofamortizationMember | 478,723 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = ogs_TotalregulatoryassetsnetofamortizationMember
Regulatory Assets | $ 487,371 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ogs_TotalregulatoryassetsnetofamortizationMember | $ 528,916 us-gaap_RegulatoryAssets / us-gaap_RegulatoryAssetAxis = ogs_TotalregulatoryassetsnetofamortizationMember

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- Definition The net amount of all current regulatory assets less all current regulatory liabilities as of the end of the period. + References No definition available. + Details
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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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