Pension and Postretirement Benefits other than Pensions - Net Periodic Benefit Cost of Defined Benefit Plans and Other Postretirement Benefit Plans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
U.S. Pension Benefits [Member]        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost $ 202 $ 232 $ 606 $ 696
Interest cost 3,145 3,084 9,435 9,252
Expected return on plan assets (3,959) (4,421) (11,877) (13,263)
Amortization of prior service cost and actuarial loss 429 276 1,287 828
Other 0 0 0 0
Net periodic benefit (income) cost (183) (829) (549) (2,487)
Non-U.S. Pension Benefits [Member]        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 861 868 2,575 2,633
Interest cost 1,267 1,261 3,805 3,845
Expected return on plan assets (788) (830) (2,367) (2,559)
Amortization of prior service cost and actuarial loss 555 665 1,664 2,012
Other 0 114 0 355
Net periodic benefit (income) cost 1,895 2,078 5,677 6,286
U.S. Other Postretirement Benefits [Member]        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 90 109 270 327
Interest cost 346 353 1,038 1,059
Amortization of prior service cost and actuarial loss (507) (396) (1,521) (1,188)
Other 1 6 3 18
Net periodic benefit (income) cost (70) 72 (210) 216
Non-U.S. Other Postretirement Benefits [Member]        
Pension Plans, Postretirement and Other Employee Benefits [Line Items]        
Service cost 94 93 280 290
Interest cost 172 165 510 516
Amortization of prior service cost and actuarial loss (16) (5) (47) (15)
Other 0 0 0 0
Net periodic benefit (income) cost $ 250 $ 253 $ 743 $ 791