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Related Party Transactions - Compensation of Key Management Personnel (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities [Abstract]      
Short-term employee benefits $ 3,814 $ 3,900 $ 3,344
Post-employment benefits 102 103 100
Termination benefits 47 43 103
Total compensation paid to key management personnel $ 3,963 $ 4,046 $ 3,547