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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2013
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Mar. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Mar. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Jun. 30, 2013
Minimum [Member]
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
Omnibus Incentive Plan New Plan 2012 [Member]
Jun. 30, 2013
Omnibus Incentive Plan New Plan 2012 [Member]
Restricted Stock [Member]
Jun. 30, 2013
2007 Stock Option and Incentive Plan (Prior Plan) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Number of shares granted                               0    
Common shares available for grant 4,411,760     4,411,760                       5,000,000    
Number of restricted shares outstanding           732,240 200,000 732,240 200,000 245,400 246,320 0 0       588,240  
Stock options granted, vesting period range                           5 years        
Stock options granted, vesting period, high end of range                             10 years      
Exercise of common stock options, shares     217,003   217,003                          
Surrender of Shares         71,409                          
Recognized compensation expenses $ 5 $ 6   $ 9 $ 59 $ 1,080 $ 153 $ 1,465 $ 153                  
Unrecognized compensation expenses related to nonvested stock options 15     15                            
Recognition of remaining compensation expense over a weighted-average period       10 months       30 months                    
Total unrecognized compensation expense, Nonvested restricted stock arrangements granted                                   15,364
Tax benefit from restricted stock dividends       $ 280 $ 437 $ 61   $ 83