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Financial Instrument - Risk Management and Fair Value - Summary of Credit Risk Exposure on Trade Receivables using Provision Matrix (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of credit risk exposure [line items]    
Gross carrying amount $ 72,172 $ 137,499
Expected credit loss $ 6,483 $ 5,579
Current [member]    
Disclosure of credit risk exposure [line items]    
Expected credit loss rate 0.00% 0.10%
Gross carrying amount $ 50,180 $ 111,778
Expected credit loss $ 20 $ 99
Past due 1 to 30 days [member]    
Disclosure of credit risk exposure [line items]    
Expected credit loss rate 0.10% 2.30%
Gross carrying amount $ 3,554 $ 6,170
Expected credit loss $ 3 $ 141
Past due 31 to 60 days [member]    
Disclosure of credit risk exposure [line items]    
Expected credit loss rate 2.50% 3.70%
Gross carrying amount $ 1,867 $ 2,786
Expected credit loss $ 46 $ 104
Past due 61 to 90 days [member]    
Disclosure of credit risk exposure [line items]    
Expected credit loss rate 3.70% 12.00%
Gross carrying amount $ 1,228 $ 1,636
Expected credit loss $ 46 $ 196
More than 90 days [member]    
Disclosure of credit risk exposure [line items]    
Expected credit loss rate 41.50% 33.30%
Gross carrying amount $ 15,343 $ 15,129
Expected credit loss $ 6,368 $ 5,039