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Related Party Transactions - Compensation of Key Management Personnel (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities [Abstract]      
Short-term employee benefits $ 3,073 $ 3,814 $ 3,900
Post-employment benefits 179 102 103
Termination benefits   47 43
Total compensation paid to key management personnel $ 3,252 $ 3,963 $ 4,046