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Reconciliation of Weighted Average Shares for Basic and Diluted Earnings Per Share (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Reconciliation Of Basic Weighted Average Shares To Diluted Weighted Average Shares [Line Items]        
Weighted average shares for basic earnings per share 25,049,888 27,829,555 25,052,488 28,223,321
Weighted average shares for diluted earnings per share 25,119,035 27,836,453 25,120,897 28,236,562
Restricted Stock
       
Reconciliation Of Basic Weighted Average Shares To Diluted Weighted Average Shares [Line Items]        
Non-vested restricted stock and options 33,178 6,880 38,759 13,223
Stock Options
       
Reconciliation Of Basic Weighted Average Shares To Diluted Weighted Average Shares [Line Items]        
Non-vested restricted stock and options 35,969 18 29,650 18