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REVENUE (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018
Unbilled Receivables, Current | $ 127,600 |  |  |  | $ 138,500 |  |  |  | $ 127,600
Regulated Operating Revenue, Gas | $ 464,466 | $ 238,280 | $ 292,521 | $ 638,464 | $ 462,394 | $ 247,142 | $ 279,689 | $ 550,408 | 1,626,618
Regulated Operating Revenue, Other |  |  |  |  |  |  |  |  | 9,919
Regulated Operating Revenue |  |  |  |  |  |  |  |  | 1,633,731
Natural gas sales to customers [Member] |  |  |  |  |  |  |  |  |
Regulated Operating Revenue, Gas |  |  |  |  |  |  |  |  | 1,495,250
Transportation revenues [Member] |  |  |  |  |  |  |  |  |
Regulated Operating Revenue, Gas |  |  |  |  |  |  |  |  | 109,658
Miscellaneous revenues [Member] |  |  |  |  |  |  |  |  |
Regulated Operating Revenue, Gas |  |  |  |  |  |  |  |  | 21,710
Other revenues - natural gas sales related [Member] |  |  |  |  |  |  |  |  |
Other revenues - natural gas sales related |  |  |  |  |  |  |  |  | (2,806)
Other revenues [Member] |  |  |  |  |  |  |  |  |
Regulated Operating Revenue, Other |  |  |  |  |  |  |  |  | $ 7,113

X
- Definition Miscellaneous revenues from contracts with customers from implied contracts established by our tariff rates approved by the regulatory authorities and includes miscellaneous service charges with the performance obligation satisfied at a point in time when services are rendered to the customer + References No definition available. + Details
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Namespace Prefix: | ogs_
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- Definition The total amount of regulated operating revenues recognized during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of regulated gas operating revenues recognized during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of regulated other operating revenues recognized during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
Name: | ogs_REVENUEAxis=ogs_NaturalgassalestocustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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