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Restricted Stock Activity (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 8,003,000 6,210,000 [1] 3,531,000
Vested 3,270,000 1,613,000 [1] 800,000
Arena Acquisitions
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted   743,119  
Vested   743,119  
[1] Excludes 743,119 restricted shares from stock awards assumed in the Arena Acquisition. All of these awards had vested as of December 31, 2010.