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Accumulated Other Comprehensive Income - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold $ (365,691) $ (378,685) $ (710,732) $ (746,114)
Selling, general and administrative (37,191) (29,137) (69,049) (60,409)
Income tax provision (10) (3,101) 5,058 1,834
Net income 1,965 2,848 18,133 16,773
Reclassifications Out of Accumulated Other Comprehensive Income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net income 2,488 1,603 4,559 4,261
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs and Expenses 4,208 4,708 7,936 9,974
Income tax provision (1,595) (1,790) (3,008) (3,790)
Net income 2,613 2,918 4,928 6,184
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Prior Service Costs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 509 574 1,013 1,142
Selling, general and administrative 166 187 336 379
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Actuarial Losses [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 2,618 2,924 4,900 6,288
Selling, general and administrative 915 1,023 1,687 2,165
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs and Expenses (373) (55) (469) (25)
Income tax provision 141 21 179 11
Net income (232) (34) (290) (14)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member] | Prior Service Costs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold (38) (57) (75) (115)
Selling, general and administrative (8) (13) (16) (25)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member] | Actuarial Losses [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold (269) 12 (311) 94
Selling, general and administrative (58) 3 (67) 21
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member] | (Gains) Losses on Cash Flow Hedges [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 215 (1,750) (83) (2,623)
Income tax provision (108) 469 4 714
Net income $ 107 $ (1,281) $ (79) $ (1,909)