Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 18,926	$ 19,805	$ 57,344	$ 44,954
Earnings from Continuing Operations	1,829	326	8,078	974
Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	1,636	146	7,506	441
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	193	180	572	533
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service credit	(468)	(703)	(1,407)	(2,107)
Actuarial loss	3,146	945	13,691	2,835
Income tax benefit	(1,042)	(96)	(4,778)	(287)
Earnings from Continuing Operations	1,636	146	7,506	441
Actuarial loss	(3,146)	(945)	(13,691)	(2,835)
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	2,678	242	12,284	728
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]
Interest expense	318	300	942	883
Income tax benefit	(125)	(120)	(370)	(350)
Earnings from Continuing Operations	$ 193	$ 180	$ 572	$ 533