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Financial Instrument - Risk Management and Fair Value - Summary of Carrying Amount and Fair Values of Financial Assets and Financial Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Long-term investments $ 119,617 $ 134,347
Loans and borrowings 1,163,900 1,060,765
Financial Assets at Fair Value, Class [Member]    
Disclosure of detailed information about financial instruments [line items]    
Long-term investments 120,938 155,051
Financial Liabilities at Fair Value, Class [Member]    
Disclosure of detailed information about financial instruments [line items]    
Loans and borrowings $ 1,327,282 $ 1,068,961