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Stockholders' Equity - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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 59,298 117,322 323,562
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 36,577 121,206 1,195,462