Debt Instrument, Lump Sum Payment

No definition available.

Name:	nvgs_DebtInstrumentLumpSumPayment
Namespace Prefix:	nvgs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line Of Credit Facility, Number Of Assets To Be Financed

No definition available.

Name:	nvgs_LineOfCreditFacilityNumberOfAssetsToBeFinanced
Namespace Prefix:	nvgs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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.

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Period between issuance and maturity of debt instrument, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DebtInstrumentTerm
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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