XML 45 R30.htm IDEA: XBRL DOCUMENT
v3.23.3

Rental Equipment (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |
Rental equipment, gross | $ 549,177 | $ 424,179
Accumulated depreciation | (193,795) | (177,729)
Rental equipment, net of accumulated depreciation | 355,382 | 246,450
Impairment of rental equipment | 0 |
Compressor units |  |
Property, Plant and Equipment [Line Items] |  |
Rental equipment, gross | 494,282 | 387,145
Work-in-process |  |
Property, Plant and Equipment [Line Items] |  |
Rental equipment, gross | $ 54,895 | $ 37,034

X
- Definition Rental Equipment, Accumulated Depreciation + References No definition available. + Details
Name: | ngs_RentalEquipmentAccumulatedDepreciation
Namespace Prefix: | ngs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Rental Equipment, Gross + References No definition available. + Details
Name: | ngs_RentalEquipmentGross
Namespace Prefix: | ngs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Rental Equipment, Net + References No definition available. + Details
Name: | ngs_RentalEquipmentNet
Namespace Prefix: | ngs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
Name: | us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ngs_RentalCompressorUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ngs_RentalCompressorUnitWorkInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |