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Deferred Consideration - Summary of valuation of deferred consideration (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Disclosure Of Valuation Of Deferred Consideration [Line Item]    
Discount rate 9.00% 9.00%
Perpetual growth rate 0.90% 1.00%
Minimum [Member]    
Disclosure Of Valuation Of Deferred Consideration [Line Item]    
Forward-looking gold price $ 1,958 $ 1,833
Maximum [Member]    
Disclosure Of Valuation Of Deferred Consideration [Line Item]    
Forward-looking gold price 2,853 2,705
Weighted Average [Member]    
Disclosure Of Valuation Of Deferred Consideration [Line Item]    
Forward-looking gold price $ 2,263 $ 2,106