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Basis of Presentation and Significant Accounting Policies - Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]            
Foreign currency translation adjustments $ (3,821)   $ (2,562)      
Net gain on investments 245   238      
Net loss on derivative financial instruments (30,090)   (45,386)      
Unrecognized losses on benefit obligations (85,555)   (92,421)      
Accumulated other comprehensive loss $ (119,221) $ (122,742) $ (140,131) $ (156,673) $ (100,697) $ (94,413)