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Investments - Additional Information (Detail) - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Dec. 31, 2022 | Aug. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022
Bear Creek [member] | Convertible Debenture [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Convertible promissory note receivable |  |  |  |  | $ 22.5
Lendings, interest rate |  |  |  |  | 6.00%
Lendings, maturity |  |  |  |  | three years
Sandbox [member] | Secured Convertible Promissory Note [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Lendings, maturity |  |  | 10 years |  |
Sandbox [member] | Secured Convertible Promissory Note [Member] | Principal Value [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Convertible promissory note receivable |  |  | $ 31.4 |  |
Sandbox [member] | Secured Convertible Promissory Note [Member] | Fair Value [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Convertible promissory note receivable | $ 14.7 |  |  |  |
Horizon Copper [member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Promissory note receivable |  |  |  | $ 33.8 |
Horizon Copper [member] | Convertible Debenture [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Lendings, maturity |  | 10 years |  |  |
Interest Holiday |  | 3-year |  |  |
Days in volume weighted average price used to determine settlement amount of convertible debenture |  | 20 days |  |  |
Maximum ownership interest in associate on settlement of debenture |  | 34.00% |  |  |
Horizon Copper [member] | Convertible Debenture [Member] | Principal Value [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Convertible promissory note receivable |  | $ 95.0 |  |  |
Horizon Copper [member] | Convertible Debenture [Member] | Fair Value [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Convertible promissory note receivable | $ 70.3 | $ 68.3 |  |  |
Horizon Copper [member] | Convertible Debenture [Member] | Secured Overnight Financing Rate [Member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Lendings, adjustment to interest rate basis |  | 2.00% |  |  |
Lendings, interest rate basis |  | SOFR |  |  |
Hod maden associate [member] | Horizon Copper [member] |  |  |  |  |
Investments with investee names [line items] |  |  |  |  |
Percentage of sale equity interest in associate |  | 30.00% |  |  |

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- Definition Days in volume weighted average price used to determine settlement amount of convertible debenture. + References No definition available. + Details
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- Details
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