Other Comprehensive Income - Changes in Accumulated Other Comprehensive Loss by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (501,492)
Other comprehensive income (loss) before reclassifications, net of tax			(115,110)
Amounts reclassified from accumulated other comprehensive loss, net of tax			34,950
Net current period other comprehensive income (loss)	18,571	37,599	(80,160)	61,193
Ending balance	(581,652)		(581,652)
Pension and Other Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(632,576)
Other comprehensive income (loss) before reclassifications, net of tax			1,790
Amounts reclassified from accumulated other comprehensive loss, net of tax			34,950
Net current period other comprehensive income (loss)			36,740
Ending balance	(595,836)		(595,836)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			131,084
Other comprehensive income (loss) before reclassifications, net of tax			(116,900)
Net current period other comprehensive income (loss)			(116,900)
Ending balance	$ 14,184		$ 14,184