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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold $ (378,685) $ (404,694) $ (746,114) $ (810,637)
Income (loss) before income taxes (253) 5,956 18,607 23,714
Selling, general and administrative (29,137) (32,314) (60,409) (65,865)
Income tax provision 3,101 (1,287) (1,834) (4,397)
Net income 2,848 4,669 16,773 19,317
Reclassifications Out of Accumulated Other Comprehensive Income [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net income 1,603 2,941 4,261 5,581
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Income (loss) before income taxes 4,708 3,935 9,974 7,609
Income tax provision (1,790) (1,491) (3,790) (2,884)
Net income 2,918 2,444 6,184 4,725
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 574 695 1,142 1,243
Selling, general and administrative 187 226 379 412
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Pension Benefits [Member] | Actuarial Losses [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 2,924 2,233 6,288 4,429
Selling, general and administrative 1,023 781 2,165 1,525
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Income (loss) before income taxes (55) 57 (25) 114
Income tax provision 21 (22) 11 (44)
Net income (34) 35 (14) 70
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 (57) (59) (115) (118)
Selling, general and administrative (13) (13) (25) (26)
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 12 106 94 212
Selling, general and administrative 3 23 21 46
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 (1,750) 641 (2,623) 1,090
Income tax provision 469 (179) 714 (304)
Net income $ (1,281) $ 462 $ (1,909) $ 786