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Basic and Diluted Net (Loss) Earnings Per Share (Parenthetical) (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Anti-dilutive securities excluded from computation of net (loss) earnings per share 9.4 10.1 9.4 7.0