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REVISIONS TO PRIOR PERIOD COMPARATIVES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
REVISIONS TO PRIOR PERIOD COMPARATIVES
Increase to income tax expense	$ 14.8
Increase to deferred tax liabilities	14.8
Increase to accumulated deficit	$ 14.8

X

- Definition

The amount of increase to accumulated deficit for correction of accounting errors in prior periods.

+ References

No definition available.

+ Details

Name:	ngd_IncreaseToAccumulatedDeficitForCorrectionOfAccountingErrorsInPriorPeriods
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of increase to deferred tax liabilities for correction of accounting errors in prior periods.

+ References

No definition available.

+ Details

Name:	ngd_IncreaseToDeferredTaxLiabilitiesForCorrectionOfAccountingErrorsInPriorPeriods
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase to income tax expenses for correction of accounting errors in prior periods.

+ References

No definition available.

+ Details

Name:	ngd_IncreaseToIncomeTaxExpensesForCorrectionOfAccountingErrorsInPriorPeriods
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ngd_RevisionsToPriorPeriodComparativesDisclosureAbstract
Namespace Prefix:	ngd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration