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Note Employee benefits (Breakdown of pension and restoration plans assets and liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities $ 0 $ 0
Non-current liabilities 70,847 123,857
Benefit Restoration Plans    
Defined Benefit Plan Disclosure [Line Items]    
Current liabilities 234 173
Non-current liabilities $ 10,448 $ 8,469