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Investments - Disclosure of Detailed Information about Financial Instruments (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | $ 24,056 |
Current investments, beginning | 5,001 |
Fair Value Adjustment in Other Comprehensive Income (Loss) | (8,450) | $ (11,847)
Fair Value Adjustment in Net Income (Loss) | 1,756 | (1,659)
Current investments, ending | 3,773 | 5,001
Non-current investments, ending | 126,117 | 24,056
Non-Current [member] |  |
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | 24,056 | 50,085
Additions | 149,501 | 20,799
Disposals | (39,065) | (34,527)
Transfers in (out) | (1,272) | (4,986)
Fair Value Adjustment | (6,633) | (7,489)
Interest Revenue | (470) | 174
Non-current investments, ending | 126,117 | 24,056
Non-Current [member] | Common Shares Held [member] |  |
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | 21,486 | 28,416
Additions | 10,748 | 20,799
Disposals | (4,820) | (15,882)
Transfers in (out) | 0 | 0
Fair Value Adjustment in Other Comprehensive Income (Loss) | (8,389) | (11,847)
Interest Revenue | 0 | 0
Non-current investments, ending | 19,025 | 21,486
Non-Current [member] | Convertible Debt [member] |  |
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | 904 | 15,525
Additions | 104,972 | 0
Disposals | (934) | (12,470)
Transfers in (out) | (1,272) | 0
Fair Value Adjustment in Net Income (Loss) | 1,334 | (2,151)
Interest Revenue | 0 | 0
Non-current investments, ending | 105,004 | 904
Non-Current [member] | Warrants and other [member] |  |
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | 1,666 | 1,143
Additions | 0 | 0
Disposals | 0 | (99)
Transfers in (out) | 0 | 0
Fair Value Adjustment in Net Income (Loss) | 422 | 622
Interest Revenue | 0 | 0
Non-current investments, ending | 2,088 | 1,666
Non-Current [member] | Vale Royalties [Member] |  |
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | 0 | 0
Additions |  | 0
Disposals |  | (5,887)
Transfers in (out) |  | 0
Fair Value Adjustment in Net Income (Loss) |  | 5,887
Interest Revenue |  | 0
Non-current investments, ending |  | 0
Non-Current [member] | Loan Receivable [Member] |  |
Disclosure of financial assets [line items] |  |
Non-current investments, beginning | 0 | 5,001
Additions | 33,781 | 0
Disposals | (33,311) | (189)
Transfers in (out) | 0 | (4,986)
Fair Value Adjustment in Net Income (Loss) | 0 | 0
Interest Revenue | (470) | 174
Non-current investments, ending | 0 | 0
Short-Term [member] |  |
Disclosure of financial assets [line items] |  |
Current investments, beginning | 5,001 | 1,867
Additions | 0 | 0
Disposals | (2,787) | (1,898)
Transfers in (out) | 1,272 | 4,986
Fair Value Adjustment | 0 | (130)
Interest Revenue | 287 | 176
Current investments, ending | 3,773 | 5,001
Short-Term [member] | Convertible Debt [member] |  |
Disclosure of financial assets [line items] |  |
Current investments, beginning | 0 | 1,852
Additions | 0 | 0
Disposals | 0 | (1,722)
Transfers in (out) | 1,272 | 0
Fair Value Adjustment in Net Income (Loss) | 0 | (130)
Interest Revenue | 0 | 0
Current investments, ending | 1,272 | 0
Short-Term [member] | Loan Receivable [Member] |  |
Disclosure of financial assets [line items] |  |
Current investments, beginning | 5,001 | 15
Additions | 0 | 0
Disposals | (2,787) | (176)
Transfers in (out) | 0 | 4,986
Fair Value Adjustment in Net Income (Loss) | 0 | 0
Interest Revenue | 287 | 176
Current investments, ending | 2,501 | 5,001
Equity Securities and Warrants and Other and Debt Securities and Loans Receivable [member] |  |
Disclosure of financial assets [line items] |  |
Total investments at beginning of period | 29,057 | 51,952
Additions | 149,501 | 20,799
Disposals | (41,852) | (36,425)
Transfers in (out) | 0 | 0
Fair Value Adjustment | (6,633) | (7,619)
Interest Revenue | (183) | 350
Total investments at end of period | $ 129,890 | $ 29,057

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