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Share Based Compensation (Schedule Of Stock-Based Activities) (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Performance Award [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1 6,341,695
Granted 0
Settled 0
Forfeited or Expired (197,695)
Outstanding at December 31 6,144,000
Weighted Average Remaining Contractual Term - Outstanding at December 31 (in years) 2 months 12 days
Aggregate Intrinsic Value - Outstanding at December 31 $ 4,915,200
Deferred Award [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1 7,271,021
Granted 0
Settled (24,840)
Forfeited or Expired (481,124)
Outstanding at December 31 6,765,057
Weighted Average Remaining Contractual Term - Outstanding at December 31 (in years) 10 months 24 days
Aggregate Intrinsic Value - Outstanding at December 31 $ 5,412,045