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Line Of Credit Facility, Current Borrowing Capacity, Component, Percentage Of Eligible Compressors For Extension Of Credit

No definition available.

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Line Of Credit Facility, Current Borrowing Capacity Component Percentage Of Eligible Inventory

No definition available.

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Line Of Credit Facility Current Borrowing Capacity Component Percentage Of Eligible Value At Cost Excluding Any Cost for Capitalized Interest Or Other Non Cash Capitalized Costs

No definition available.

Name:	ngs_LineOfCreditFacilityCurrentBorrowingCapacityComponentPercentageOfEligibleValueAtCostExcludingAnyCostForCapitalizedInterestOrOtherNonCashCapitalizedCosts
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Line Of Credit Facility, Current Borrowing Capacity, Net Liquidation Value Of Percentage Of Eligible Compressors For Extension Of Credit

No definition available.

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No definition available.

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Balance Type:	credit
Period Type:	instant

No definition available.

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Line Of Credit Facility Fixed Charge Coverage Ratio

No definition available.

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Line Of Credit Facility Leverage Ratio

No definition available.

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Line Of Credit Facility, Non Exceeding Cap Of Component Capacity

No definition available.

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No definition available.

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Balance Type:	credit
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No definition available.

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Line Of Credit Facility, Term For Depreciation

No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

No definition available.

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Weighted average interest rate of long-term debt outstanding calculated over time.

No definition available.

Name:	us-gaap_LongTermDebtWeightedAverageInterestRateOverTime
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Name:	srt_RangeAxis=srt_MaximumMember
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