Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance			$ (720,211)	$ (397,655)
Other comprehensive loss before reclassifications, net of tax			(211,868)	(60,734)
Amounts reclassified from accumulated other comprehensive loss, net of tax			17,493	11,535
Net current period other comprehensive income (loss)	$ (105,085)	$ (95,439)	(194,375)	(49,199)
Ending balance	(914,586)	(446,854)	(914,586)	(446,854)
Pension and Other Post-Retirement Benefits [Member]
Components of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance			(533,213)	(360,036)
Other comprehensive loss before reclassifications, net of tax				(4,416)
Amounts reclassified from accumulated other comprehensive loss, net of tax			17,493	11,535
Net current period other comprehensive income (loss)			17,493	7,119
Ending balance	(515,720)	(352,917)	(515,720)	(352,917)
Foreign Currency Translation [Member]
Components of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance			(186,998)	(37,619)
Other comprehensive loss before reclassifications, net of tax			(211,868)	(56,318)
Net current period other comprehensive income (loss)			(211,868)	(56,318)
Ending balance	$ (398,866)	$ (93,937)	$ (398,866)	$ (93,937)