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Earnings (Loss) Per Share - Additional Information (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings (loss) per share, amount 899,215 3,037,496 1,038,824 3,035,654