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Stock-Based Compensation (Detail) - (Table 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Total $ 5,151 $ 4,007
Restricted Stock [Member]
   
Allocated Share-based Compensation Expense 3,615 2,451
Stock Options [Member]
   
Allocated Share-based Compensation Expense $ 1,536 $ 1,556