Accumulated Other Comprehensive Income (Loss) ("AOCI") Included in Stockholders' (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustments	$ (12,438)		$ (6,888)
Net loss on investments	(4,403)		(4,330)
Net (gain) loss on derivative financial instruments	3,089		(855)
Unrecognized losses on benefit obligations	(88,278)	[1]	(151,644)	[1]
Accumulated other comprehensive loss	$ (102,030)		$ (163,717)

[1] Amortization of benefit plan costs in the consolidated statements of equity is shown net of $0 and $18.6 million of taxes as of December 31, 2011 and 2010, respectively. Future amortization will not reflect a tax benefit until those benefits can be recognized and the existing deferred tax benefits will not change significantly.