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Stock-Based Compensation (Detail) - (Table 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Total $ 4,914 $ 4,711 $ 15,236 $ 12,660
Restricted Stock [Member]
       
Allocated Share-based Compensation Expense 3,837 3,319 11,288 8,177
Stock Options [Member]
       
Allocated Share-based Compensation Expense $ 1,077 $ 1,392 $ 3,948 $ 4,483