Reclassification of Amounts from Other Comprehensive Income Loss to Earnings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reclassification Adjustment for Cash Flow Hedges
Interest expense	$ 6,314	$ 11,657	$ 19,619
Benefit from income taxes	(2,498)	(4,506)	(8,910)
Total	3,816	7,151	10,709
Amortization of Pension and Postretirement Plan Actuarial Loss and Prior Service Cost
Cost of goods sold	15,665	9,458	4,783
Selling, administrative and general expenses	4,109	3,027	1,588
Benefit from income taxes	(7,809)	(4,775)	(2,781)
Total	11,965	7,710	3,590
Total reclassifications from AOCI to earnings	$ 15,781	$ 14,861	$ 14,299