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Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute Basic and Diluted Net (Loss) Income Per Share (Detail) - shares
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
 [1]
Dec. 31, 2016
 [1]
Earnings Per Share [Abstract]      
Basic common shares outstanding 69,598 68,949 68,373
Common stock equivalents 1,884    
Diluted common shares outstanding 71,482 68,949 68,373
[1] Due to the fact that we reported a loss from continuing operations for the years ended December 31, 2017 and 2016, potential common stock equivalents were 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 years ended December 31, 2017 and 2016.