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Stockholders' Equity - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Restricted Stock and Stock Options [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from the computation of diluted earnings per share 203,951 342,342 17,310 126,342
Stock Appreciation Rights [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from the computation of diluted earnings per share 57,895 941,914 48,770 161,608