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Total Share-Based Compensation Expense and Related Tax Benefits Recognized (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock compensation expense $ 183 $ 468 $ 391 $ 806
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to restricted stock compensation $ 53 $ 177 $ 132 $ 304