Amounts Included in Accumulated Other Comprehensive (Loss) Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (115,282)	$ (63,026)	$ (55,601)
Other comprehensive (loss) income	5,369	(52,256)	(7,425)
Ending Balance	(109,913)	(115,282)	(63,026)
Unrecognized Net Defined Benefit Plan Costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(99,209)	(73,607)	(69,798)
Other comprehensive (loss) income	(6,466)	(25,602)	(3,809)
Ending Balance	(105,675)	(99,209)	(73,607)
Change in Fair Value of Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(6,822)	(6,695)	(7,895)
Other comprehensive (loss) income	(905)	(127)	1,200
Ending Balance	(7,727)	(6,822)	(6,695)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(9,251)	17,276	22,092
Other comprehensive (loss) income	12,740	(26,527)	(4,816)
Ending Balance	$ 3,489	$ (9,251)	$ 17,276