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Computation of Earnings Per Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted share units excluded from calculation of diluted earnings (loss) per share 60,350 53,100 61,800 51,650
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted share units excluded from calculation of diluted earnings (loss) per share 0 16,486 0 14,641