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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) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2016
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% |
Marverix Metals Incorporated [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |
Common shares | 10,000,000 | 10,000,000
Percentage of ownership on diluted basis | 20.50% |

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- Definition Common share purchase warrants. + References No definition available. + Details
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- Definition Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] + References No definition available. + Details
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- Details
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