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Computation of Earnings Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Equity Option [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted shares excluded from calculation of diluted earnings per share 25,750 22,500 20,750 17,750
Restricted Stock [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted shares excluded from calculation of diluted earnings per share 51,425 0 49,967 0