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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%