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Pension and other postretirement benefits - amounts recognized in consolidated balance sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Payroll and benefit-related liabilities $ (82,679) $ (84,658)
Pension and postretirement benefit liabilities (133,062) (149,441)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 106 0
Payroll and benefit-related liabilities (1,640) (1,653)
Pension and postretirement benefit liabilities (88,775) (104,132)
Accumulated other comprehensive loss 209,785 213,301
Amounts recognized in balance sheet 119,476 107,516
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Payroll and benefit-related liabilities (3,200) (3,307)
Pension and postretirement benefit liabilities (44,287) (45,309)
Accumulated other comprehensive loss 4,415 4,223
Amounts recognized in balance sheet $ (43,072) $ (44,393)