Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax (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
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			$ (109,913)
Other comprehensive loss before reclassifications			(4,458)
Amounts reclassified from accumulated other comprehensive loss			8,152
Other comprehensive income	13,663	16,698	3,694	10,502
Balance at September 30, 2013	(106,219)	(104,780)	(106,219)	(104,780)
Unrecognized Net Defined Benefit Plan Costs
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			(105,675)
Other comprehensive loss before reclassifications			318
Amounts reclassified from accumulated other comprehensive loss			5,399
Other comprehensive income			5,717
Balance at September 30, 2013	(99,958)		(99,958)
Change in Fair Value of Derivatives
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			(7,727)
Other comprehensive loss before reclassifications			260
Amounts reclassified from accumulated other comprehensive loss			2,753
Other comprehensive income			3,013
Balance at September 30, 2013	(4,714)		(4,714)
Foreign Currency Translation
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			3,489
Other comprehensive loss before reclassifications			(5,036)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income			(5,036)
Balance at September 30, 2013	$ (1,547)		$ (1,547)