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Related Party Transactions - Compensation of Key Management Personnel (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Amounts Incurred By Entity For Provision Of Key Management Personnel Services Provided By Separate Management Entities [Abstract]      
Short-term employee benefits $ 3,900 $ 3,344 $ 3,382
Post-employment benefits 103 100 87
Termination benefits 43 103 80
Total compensation paid to key management personnel $ 4,046 $ 3,547 $ 3,549