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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 (Detail) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
 [1]
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Basic common shares outstanding 69,082 68,460 68,897 68,328
Common stock equivalents 1,783   1,763 561
Diluted common shares outstanding 70,865 68,460 70,660 68,889
[1] Due to the fact that we reported a loss from continuing operations for the quarter ended September 30, 2016, potential common stock equivalents are excluded from the diluted common shares outstanding calculation. Per FASB ASC Topic 260 – Earnings Per Share, an entity that reports discontinued operations shall use income or loss from continuing operations as the benchmark for calculating diluted common shares outstanding, and as such, we have zero common stock equivalents since these shares would have an anti-dilutive effect on our net loss per share for the quarter ended September 30, 2016.