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Loan Advanced - Contractor - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure loan advanced contractor [line items]    
Loan advanced - contractor $ 68.4 $ 0.0
Mining Contractor Higher Market Value Percentage   25.00%
Percentage of Premiums Payout Value   25.00%
Twarka and damang [member] | Gold fields and engineers and planners [member]    
Disclosure loan advanced contractor [line items]    
Loan advanced - contractor $ 68.4  
Advance Loan - Commencement Date February 2021  
Advance Loan Maturity Date October 2023