Accumulated Other Comprehensive Loss included in Stockholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments	$ (3,366)		$ (12,438)
Net loss on investments	(2,316)		(4,403)
Net gain on derivative financial instruments	11,735		3,089
Unrecognized losses on benefit obligations	(100,466)		(88,278)
Accumulated other comprehensive loss	$ (94,413)	[1]	$ (102,030)	[1]

[1] The tax impact on amounts presented in AOCI are not significant.