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LONG-TERM DEBT (Details) (Parenthetical) | 12 Months Ended
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Dec. 31, 2017
Senior unsecured notes - due April 15, 2020 |
Long Term Debt [Line Items] |
Borrowings, maturity | April 15, 2020
Senior unsecured notes - due November 15, 2022 |
Long Term Debt [Line Items] |
Borrowings, maturity | November 15, 2022
Senior unsecured notes - due November 15, 2025 |
Long Term Debt [Line Items] |
Borrowings, maturity | November 15, 2025

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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsMaturity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ngd_LongTermDebtLineItems
Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentyUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentyTwoUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentyFiveUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |