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OTHER INCOME AND OTHER EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other, net	$ (2,194)	$ (3,900)	$ (4,358)	$ (7,307)
Net periodic cost other than service cost [Member]
Other, net	(2,403)	(4,313)	(4,137)	(8,626)
Other, net [Member]
Other, net	$ 209	$ 413	$ (221)	$ 1,319

X

- Definition

Amount of income (expense) related to nonoperating activities, classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ogs_OTHERINCOMEANDOTHEREXPENSEAxis=ogs_NetperiodiccostotherthanservicecostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ogs_OTHERINCOMEANDOTHEREXPENSEAxis=ogs_OthernetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: