Reclassifications Out of Accumulated Other Comprehensive Loss (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax effect	$ 96	$ 1,566	$ 7	$ 2,605
Earnings from Continuing Operations	53,903	72,309	90,445	84,730
Additional interest expense	(19,805)	(13,518)	(44,954)	(40,633)
Tax effect	120	111	350	326
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement expense		729		729
Prior service credit	(703)	(702)	(2,107)	(2,104)
Actuarial loss	945	3,926	2,835	11,779
Earnings from Continuing Operations	146	2,387	441	6,285
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Deferred Income Taxes
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax effect	(96)	(1,566)	(287)	(4,119)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Cost of sale; Selling, General & Administrative Expenses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications out of accumulated other comprehensive loss before taxes	242	3,953	728	10,404
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	180	168	533	497
Additional interest expense	300	279	883	823
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap | Deferred Income Taxes
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax effect	$ (120)	$ (111)	$ (350)	$ (326)