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Computation of Earnings Per Share - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Restricted share units excluded from calculation of diluted earnings per share 58,350 25,000 1,500
Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Restricted share units excluded from calculation of diluted earnings per share 0 52,368 0