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Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
U.S.
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 326 $ 547 $ 763 $ 1,033
Interest cost 1,209 1,083 2,152 2,175
Expected return on plan assets (1,310) (1,186) (2,663) (2,397)
Net amortization 1,377 1,836 2,991 3,427
Net periodic benefit cost 1,602 2,280 3,243 4,238
Non-U.S.
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 345 336 684 678
Interest cost 533 548 1,052 1,105
Expected return on plan assets (260) (260) (516) (517)
Net amortization 237 84 468 167
Net periodic benefit cost 855 708 1,688 1,433
Other Postretirement Benefit Plans
        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 242 191 485 381
Interest cost 227 228 454 457
Net amortization 6 (37) 11 (74)
Net periodic benefit cost $ 475 $ 382 $ 950 $ 764