Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 20,294	$ 19,087	$ 40,328	$ 38,418
Earnings from Continuing Operations	1,733	4,350	3,501	6,249
Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	1,529	4,158	3,096	5,870
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	204	192	405	379
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement charge			59
Prior service credit	(518)	(469)	(806)	(939)
Actuarial loss	3,007	7,274	5,787	10,546
Income tax benefit	(960)	(2,647)	(1,944)	(3,737)
Earnings from Continuing Operations	1,529	4,158	3,096	5,870
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	2,489	6,805	5,040	9,607
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	340	317	672	624
Income tax benefit	(136)	(125)	(267)	(245)
Earnings from Continuing Operations	$ 204	$ 192	$ 405	$ 379