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Earnings (Loss) Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Earnings Per Share [Abstract]          
Options to purchase shares, restricted share awards, and contingently issuable shares excluded from diluted net earnings (loss) per share computation 3,300,000 9,900,000 10,100,000 6,100,000  
Common stock outstanding 118,293,967   118,293,967   117,336,797