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Major Group Investments Direct and Indirect - Summary of Share Held in Investments in Associates Joint Ventures other Equity Investments and Percentage of Beneficial Interest (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017
Cardinal Resources Limited Options [member] | Equity investments [member] |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |
Effective interest rate in stock option | 20.00%

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