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Employee Benefit - Sensitivity Analysis of One-percentage Point Change in Assumed Rates (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Discount rate [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Assumption - 1% increase $ (1,003) $ (777)
Assumption - 1% decrease 1,178 908
Rate of salary increase [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Assumption - 1% increase 1,115 869
Assumption - 1% decrease $ (973) $ (762)