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Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold $ 391,805 $ 347,029 $ 1,126,271 $ 1,030,717
Selling, general and administrative 34,480 29,380 102,495 89,460
Income tax provision 7,008 (7,136) 1,063 (15,689)
Reclassifications Out of Accumulated Other Comprehensive Income [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Net of tax 4,074 2,500 11,861 7,646
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedges [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Income tax provision (104) 202 (174) 517
Net of tax 280 (513) 467 (1,315)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Pension Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Before tax 6,010 4,869 18,032 14,606
Income tax provision (2,264) (1,812) (6,782) (5,516)
Net of tax 3,746 3,057 11,250 9,090
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Amortization of Deferred Benefit Other Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Before tax 77 (69) 231 (207)
Income tax provision (29) 25 (87) 78
Net of tax 48 (44) 144 (129)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | (Gains) Losses on Cash Flow Hedges [Member] | Cash Flow Hedges [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 384 (715) 641 (1,832)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Prior Service Costs [Member] | Amortization of Deferred Benefit Pension Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 572 482 1,838 1,519
Selling, general and administrative 201 132 483 322
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Prior Service Costs [Member] | Amortization of Deferred Benefit Other Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold (100) (190) (301) (570)
Selling, general and administrative (25) (44) (74) (133)
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Actuarial Losses [Member] | Amortization of Deferred Benefit Pension Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 3,792 3,272 12,209 10,323
Selling, general and administrative 1,445 983 3,502 2,442
Reclassifications Out of Accumulated Other Comprehensive Income [Member] | Actuarial Losses [Member] | Amortization of Deferred Benefit Other Plan Items [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Costs of products sold 155 128 465 384
Selling, general and administrative $ 47 $ 37 $ 141 $ 112