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Pension and other postretirement benefits - (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning of year $ 315,951    
Fair value of plan assets, end of year 340,265 $ 315,951  
Pension      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 421,736 447,964  
Service cost 2,615 1,880 $ 1,794
Interest cost 15,711 17,948 18,000
Actuarial loss (gain) 16,315 (22,880)  
Currency translation (4,300) (2,721)  
Benefits paid (18,887) (18,682)  
Medicare Part D reimbursement 0 0  
Curtailments (23) 0  
Administrative costs (2,593) (1,773)  
Projected benefit obligation, end of year 430,574 421,736 447,964
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets, beginning of year 315,951 328,830  
Actual return on plan assets 36,620 (4,460)  
Contributions 12,752 12,797  
Benefits paid (18,887) (18,682)  
Administrative costs (2,593) (1,773)  
Currency translation (3,578) (761)  
Fair value of plan assets, end of year 340,265 315,951 328,830
Funded status, end of year (90,309) (105,785)  
Other Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 48,616 53,154  
Service cost 355 495 424
Interest cost 1,595 1,967 2,169
Actuarial loss (gain) 646 (3,914)  
Currency translation 0 0  
Benefits paid (3,946) (3,216)  
Medicare Part D reimbursement 221 130  
Curtailments 0 0  
Administrative costs 0 0  
Projected benefit obligation, end of year 47,487 48,616 $ 53,154
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid (3,946) (3,216)  
Administrative costs 0 0  
Funded status, end of year $ (47,487) $ (48,616)