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Stock-Based Compensation (Detail) - (Table 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Total $ 4,852 $ 5,171 $ 9,776 $ 10,322
Restricted Stock [Member]
       
Allocated Share-based Compensation Expense 3,728 3,836 7,513 7,451
Stock Options [Member]
       
Allocated Share-based Compensation Expense $ 1,124 $ 1,335 $ 2,263 $ 2,871