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Cash Flow Information - Summary of Investing Activities with Partial Cash Payments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Investing Activities With Partial Cash Payments [Line Items]      
Cash paid during the year $ 14,537 $ 5,442 $ 4,441
Purchase of PPE [Member]      
Disclosure Of Investing Activities With Partial Cash Payments [Line Items]      
Acquisition of property, plant and equipment 16,696 3,406  
Add: Payable for PPE or CIP - Opening 355 213  
Less: Payable for PPE or CIP - Ending (196) (355)  
Less: Prepayment for PPE & CIP - Opening (2,388) (210)  
Add: Prepayment for PPE & CIP - Ending 70 2,388  
Cash paid during the year 14,537 $ 5,442  
Investment Properties [Member]      
Disclosure Of Investing Activities With Partial Cash Payments [Line Items]      
Acquisition of investment properties 5,197    
Less: acquisition by assuming directly related liabilities (3,375)    
Less: noncash other operating income (60)    
Cash paid during the year $ 1,762