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Stock Benefit Plans - Stock-based compensation expenses (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Allocated Share-based Compensation Expense $ 1,057 $ 411 $ 1,677 $ 436
Stock Options [Member]
       
Allocated Share-based Compensation Expense 26 26 51 42
Restricted Stock [Member]
       
Allocated Share-based Compensation Expense $ 1,031 $ 385 $ 1,626 $ 394