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Retirement Plans - Defined Benefit Plan, Amounts Recognized in Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Long-term defined benefit plan liabilities $ (55,853) $ (67,334)
United States [Member] | Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Long-term defined benefit plan assets   4,562
Current defined benefit plan liabilities (972) (76)
Long-term defined benefit plan liabilities   (1,177)
Net amount of defined benefit plan recognized in balance sheet (972) 3,309
United States [Member] | Retiree Healthcare Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current defined benefit plan liabilities (387) (347)
Long-term defined benefit plan liabilities (6,257) (5,649)
Net amount of defined benefit plan recognized in balance sheet (6,644) (5,996)
Non-U.S. Pension Plans [Member] | Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Long-term defined benefit plan assets 3,284 1,245
Current defined benefit plan liabilities (1)  
Long-term defined benefit plan liabilities (15,418) (22,633)
Net amount of defined benefit plan recognized in balance sheet $ (12,135) $ (21,388)