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Financial Risk Management - Summary of Hedge Positions (Detail) $ / T in Thousands | 12 Months Ended
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Dec. 31, 2017 $ / T T
Lead 1 [member] |
Disclosure of detailed information about hedged items [line items] |
Hedged per Amount | T | 7,668
Maturity | Jan 2018 - Jun 2018
Lead 2 [member] |
Disclosure of detailed information about hedged items [line items] |
Hedged per Amount | T | 7,668
Maturity | Jul 2018 - Dec 2018
Zinc1 [member] |
Disclosure of detailed information about hedged items [line items] |
Hedged per Amount | T | 12,708
Maturity | Jan 2018 - Jun 2018
Zinc 2 [member] |
Disclosure of detailed information about hedged items [line items] |
Hedged per Amount | T | 12,708
Maturity | Jul 2018 - Dec 2018
PUT [member] | Lead 1 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 2,300
PUT [member] | Lead 2 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 2,300
PUT [member] | Zinc1 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 2,850
PUT [member] | Zinc 2 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 2,850
CALL [member] | Lead 1 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 2,625
CALL [member] | Lead 2 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 2,735
CALL [member] | Zinc1 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 3,470
CALL [member] | Zinc 2 [member] |
Disclosure of detailed information about hedged items [line items] |
Fair value hedges | 3,600

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- Details
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- Details
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