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Computation of Basic and Diluted Net (Loss) Income Per Common Share (Parenthetical) (Detail)
shares in Millions
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Convertible Notes  
Net Income Loss Per Common Share  
Initial debt conversion price | $ / shares $ 31.80
Shares that would be issued upon conversion | shares 14.5
Convertible Notes Hedge Warrant  
Net Income Loss Per Common Share  
Initial debt conversion price | $ / shares $ 39.91
Shares that would be issued upon conversion | shares 14.5