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Related Party Transactions - Compensation of Key Management Personnel (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities [Abstract]      
Short-term employee benefits $ 3,050 $ 3,073 $ 3,814
Post-employment benefits 114 179 102
Termination benefits     47
Total compensation paid to key management personnel $ 3,164 $ 3,252 $ 3,963