Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ (397,655)	$ (501,492)
Other comprehensive income (loss) before reclassifications, net of tax			38,639	(122,269)
Amounts reclassified from accumulated other comprehensive (loss) income, net of tax			7,601	23,538
Net current period other comprehensive income (loss)	42,347	(102,289)	46,240	(98,731)
Ending balance	(351,415)	(600,223)	(351,415)	(600,223)
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			7,601	23,538
Net current period other comprehensive income (loss)			7,601	23,538
Ending balance	(352,435)	(609,038)	(352,435)	(609,038)
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			38,639	(122,269)
Net current period other comprehensive income (loss)			38,639	(122,269)
Ending balance	$ 1,020	$ 8,815	$ 1,020	$ 8,815