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Accumulated Other Comprehensive Income - Schedule of Amounts Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold $ 385,439 $ 391,805 $ 1,196,076 $ 1,126,271
Selling, general and administrative 37,886 34,480 103,751 102,495
Income tax provision 9,037 (7,008) 13,434 (1,063)
Reclassifications Out of Accumulated Other Comprehensive Income [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Net of tax 2,494 4,074 8,075 11,861
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Pension Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Before tax 3,804 6,010 11,413 18,032
Income tax provision (1,441) (2,264) (4,325) (6,782)
Net of tax 2,363 3,746 7,088 11,250
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Pension Plan Items [Member] | Prior Service Costs [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 621 572 1,864 1,838
Selling, general and administrative 206 201 618 483
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Pension Plan Items [Member] | Actuarial Losses [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 2,215 3,792 6,644 12,203
Selling, general and administrative 762 1,445 2,287 3,508
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Before tax 57 77 171 231
Income tax provision (22) (29) (66) (87)
Net of tax 35 48 105 144
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 (59) (100) (178) (301)
Selling, general and administrative (13) (25) (38) (74)
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 106 155 319 465
Selling, general and administrative 23 47 68 141
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 137 384 1,227 641
Income tax provision (41) (104) (345) (174)
Net of tax $ 96 $ 280 $ 882 $ 467