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Computation of Earnings Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2014
Mar. 31, 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 17,000 0
Restricted Stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Restricted shares excluded from calculation of diluted earnings per share 55,312 2,058