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Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share, Unvested Restricted Stock Awards (Detail) (Unvested Restricted Stock Awards Excluded from EPS [Member])
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Unvested Restricted Stock Awards Excluded from EPS [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potential common shares excluded from EPS 630,489 441,495 630,489 434,066