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Earnings Per Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Stock Options
     
Computation Of Earnings Per Share Line Items      
Anti-dilutive shares excluded from the computation of diluted earnings per share 107,000 263,000 107,000
Restricted Stock
     
Computation Of Earnings Per Share Line Items      
Anti-dilutive shares excluded from the computation of diluted earnings per share 357,593 317,001 357,593