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Defined Benefit Plans - Summary of Sensitivity of the Overall Pension Obligation to Changes in the Weighted Principal Assumptions (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Discount rate [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Impact on overall obligation, due to 0.5 % increase in actuarial assumption $ (2,855)
Impact on overall obligation, due to 0.5 % decrease in actuarial assumption $ 3,157
Change in assumption, increase 0.50%
Change in assumption, decrease 0.50%
Salary escalation rate [member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Impact on overall obligation, due to 0.5 % increase in actuarial assumption $ 8
Impact on overall obligation, due to 0.5 % decrease in actuarial assumption $ (14)
Change in assumption, increase 0.50%
Change in assumption, decrease 0.50%