Amounts Included in Accumulated Other Comprehensive Loss, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			$ (109,913)
Other comprehensive loss before reclassifications			(15,127)
Amounts reclassified from accumulated other comprehensive loss			5,158
Other comprehensive loss	(1,428)	(21,590)	(9,969)	(6,196)
Balance at June 30, 2013	(119,882)	(121,478)	(119,882)	(121,478)
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			3,441
Other comprehensive loss			3,759
Balance at June 30, 2013	(101,916)		(101,916)
Change in Fair Value of Derivatives
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			(7,727)
Other comprehensive loss before reclassifications			1,144
Amounts reclassified from accumulated other comprehensive loss			1,717
Other comprehensive loss			2,861
Balance at June 30, 2013	(4,866)		(4,866)
Foreign Currency Translation
Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2012			3,489
Other comprehensive loss before reclassifications			(16,589)
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive loss			(16,589)
Balance at June 30, 2013	$ (13,100)		$ (13,100)