Reclassification of Amounts from Other Comprehensive Income Loss to Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Reclassification Adjustment for Cash Flow Hedges
Interest expense	$ 1,615	$ 1,499	$ 4,755	$ 10,131
Benefit from income taxes	(640)	(599)	(1,887)	(3,778)
Total	975	900	2,868	6,353
Amortization of Pension and Postretirement Plan Actuarial Loss and Prior Service Cost
Cost of goods sold	4,092	2,407	12,066	7,104
Selling, administrative and general expenses	977	715	3,141	2,260
Benefit from income taxes	(1,985)	(1,237)	(5,955)	(3,321)
Total	3,084	1,885	9,252	6,043
Total reclassifications from AOCI to earnings	$ 4,059	$ 2,785	$ 12,120	$ 12,396