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Earnings (Loss) Per Share - Additional Information (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Earnings Per Share [Abstract]          
Options to purchase shares, restricted share awards, and contingently issuable shares excluded from diluted net loss per share computation 1,200,000 3,300,000 8,000,000 10,100,000  
Common stock outstanding 115,981,696   115,981,696   117,096,731