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Fair Value Measurements (Schedule Of Available For Sale Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Cost $ 8,442 $ 12,976
Gross Unrealized Losses 0 0
Gross Unrealized Gains 1,283 106,220
Fair value 9,725 119,196
Available-for-sale Securities [Member]
   
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Cost 659 5,207
Gross Unrealized Losses 0 0
Gross Unrealized Gains 1,283 106,220
Fair value 1,942 111,427
Cost-method Investments [Member]
   
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]    
Cost 7,783 7,769
Gross Unrealized Losses 0 0
Gross Unrealized Gains 0 0
Fair value $ 7,783 $ 7,769