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Net Income (Loss) Per Share - Narrative (Detail) - $ / shares
shares in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Share of common stock excluded from diluted net loss per share calculation (in shares) 0.2 0.4
Deferred stock units, performance-based stock units and restricted stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Share of common stock excluded from diluted net loss per share calculation (in shares) 0.3 0.8
Convertible Senior Debentures due 2018    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Share of common stock excluded from diluted net loss per share calculation (in shares)   1.1
Minimum | Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares of common stock at prices ranging, lower limit (in dollars per share) $ 9.83 $ 9.83
Maximum | Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Shares of common stock at prices ranging, lower limit (in dollars per share) $ 19.41 $ 19.95