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Employee Benefits - Pension and Other Defined Contribution Retirement Plan Expenses (Detail) - Pension Plans - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned $ 474 $ 596 $ 948 $ 1,192
Interest cost on projected benefit obligation 5,453 4,790 10,906 9,580
Expected return on plan assets (6,983) (7,740) (13,966) (15,479)
Net amortization and deferrals 1,276 1,549 2,551 3,098
Net periodic benefit (income) cost 220 (805) 439 (1,609)
Non-U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned 4,873 4,470 9,746 8,939
Interest cost on projected benefit obligation 4,435 4,338 8,870 8,675
Expected return on plan assets (10,904) (12,032) (21,808) (24,064)
Net amortization and deferrals 2,922 2,972 5,844 5,943
Net periodic benefit (income) cost $ 1,326 $ (252) $ 2,652 $ (507)