Net Income (Loss) per Common Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Net Income Loss Per Common Share [Line Items]
Common shares loaned under the share lending arrangement, issued and outstanding					9,000,000
Antidilutive securities not included in calculation of diluted earnings per share amount	78,085,579	30,416,127	82,158,388	30,416,127