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Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute Basic and Diluted Net Income (Loss) Per Share (Parenthetical) (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2015
Earnings Per Share [Abstract]      
Anti-dilutive awards excluded from computations of diluted earnings per share 0 0 0