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Net Pension Assets - Summary of Net Pension Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of net defined benefit asset (liability) [line items]      
Pension assets $ 23,794 $ 25,946  
Employee benefits liability (20,609) (17,120)  
Net pension asset 3,185 8,826 $ 6,050
Post employment benefits [member]      
Disclosure of net defined benefit asset (liability) [line items]      
Employee benefits liability (19,997) (16,498)  
Other employee benefits [member]      
Disclosure of net defined benefit asset (liability) [line items]      
Employee benefits liability $ (612) $ (622)