Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive (Loss) Income by Component (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
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (397,655)	$ (501,492)
Other comprehensive income (loss) before reclassifications, net of tax			(60,734)	(115,110)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax			11,535	34,950
Net current period other comprehensive income (loss)	(95,439)	18,571	(49,199)	(80,160)
Ending balance	(446,854)	(581,652)	(446,854)	(581,652)
Pension and Other Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(360,036)	(632,576)
Other comprehensive income (loss) before reclassifications, net of tax			(4,416)	1,790
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax			11,535	34,950
Net current period other comprehensive income (loss)			7,119	36,740
Ending balance	(352,917)	(595,836)	(352,917)	(595,836)
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			(56,318)	(116,900)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax
Net current period other comprehensive income (loss)			(56,318)	(116,900)
Ending balance	$ (93,937)	$ 14,184	$ (93,937)	$ 14,184