Other Comprehensive Income - Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (397,655)	$ (501,492)
Other comprehensive income (loss) before reclassifications, net of tax	102	(8,220)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax	3,791	11,778
Net current period other comprehensive income (loss)	3,893	3,558
Ending balance	(393,762)	(497,934)
Pension and Other Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(360,036)	(632,576)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax	3,791	11,778
Net current period other comprehensive income (loss)	3,791	11,778
Ending balance	(356,245)	(620,798)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(37,619)	131,084
Other comprehensive income (loss) before reclassifications, net of tax	102	(8,220)
Net current period other comprehensive income (loss)	102	(8,220)
Ending balance	$ (37,517)	$ 122,864