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Computation of Earnings Per Share - Additional Information (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Restricted shares excluded from calculation of diluted earnings per share 1,500 17,750 4,500
Restricted Stock [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Restricted shares excluded from calculation of diluted earnings per share 0 37,985 0