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Employee Benefit - Summary of Employee Benefit Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Net Defined Benefit Liability Asset [Abstract]    
Pension-Defined benefit plans, current $ 855 $ 877
Long service leave, current 427 456
Employee benefit liabilities, current 1,282 1,333
Pension-Defined benefit plans, non-current 8,161 7,416
Long service leave, non-current 112 130
Employee benefit liabilities, non-current 8,273 7,546
Pension-Defined benefit plans 9,016 8,293
Long service leave 539 586
Employee benefit liabilities $ 9,555 $ 8,879