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LONG-TERM DEBT (Details 1) - 2022 Unsecured Notes [member]	12 Months Ended
	Dec. 31, 2018
2019
Long Term Debt [Line Items]
Redemption price percentage of borrowings	102.08%
2020 and thereafter
Long Term Debt [Line Items]
Redemption price percentage of borrowings	101.04%
2021 and thereafter
Long Term Debt [Line Items]
Redemption price percentage of borrowings	100.00%

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- References

No definition available.

+ Details

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- Definition

The percentage rate of the aggregate principle amount that determines the redemption price of borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	ngd_
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- Details

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Namespace Prefix:
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- Details

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- Details

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Period Type:

X

- Details

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