Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) per Share - Additional Information (Detail)

v3.10.0.1
Net Income (Loss) per Share - Additional Information (Detail) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock Options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive securities excluded from EPS calculation 0.3 1.6 1.7