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Computation of Earnings Per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock Options [Member]
       
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted shares excluded from calculation of diluted earnings per share 0 25,750 0 22,750
Restricted Stock [Member]
       
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted shares excluded from calculation of diluted earnings per share 5,614 4,588 3,846 0