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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Discount rates 13.80%    
Increase in discount rate 15.20%    
Intangible assets $ 95,568 $ 108,116 $ 101,168
Percentage of rise in increase in discount rate 1.40%    
Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Estimated recoverable amount $ 2,500,000 $ 4,300,000  
Percentage of growth rate 4.50% 3.00%  
Discount rates 13.80% 13.50%  
Intangible assets $ 20,380 $ 20,380 $ 20,380
Capitalised development expenditure [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets 10,800 $ 23,600  
Amortization expense 2,500    
Capitalised development expenditure [member] | Covid 19 [Member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Impairment loss $ 1,000