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Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Foreign currency translation adjustments $ (2,562) $ (3,366)
Net loss on investments 238 (2,316)
Net gain on derivative financial instruments (45,386) 11,735
Unrecognized losses on benefit obligations (92,421) (100,466)
Accumulated other comprehensive loss $ (140,131) [1] $ (94,413) [1]
[1] The tax impact on amounts presented in AOCI are not significant.