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Earnings Per Share - Additional Information (Detail)
12 Months Ended
Dec. 31, 2013
Options to Purchase Common Stock [Member]
Dec. 31, 2012
Options to Purchase Common Stock [Member]
Dec. 31, 2013
Common Stock Equivalents [Member]
Dec. 31, 2011
Common Stock Equivalents [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding options not included in diluted earnings per share 1,186,259 789,650 101,672 344,168