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Accounts and Transactions with Related Parties - Summary of Key Management Personnel Compensation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [abstract]      
Short-term employee benefits $ 5,133 $ 3,763 $ 3,570
Post-employment pension 99 72 68
Share-based payments 5,524 5,799 3,023
Total $ 10,756 $ 9,634 $ 6,661