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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
 [1]
Jun. 30, 2016
Jun. 30, 2015
 [1]
Earnings Per Share [Abstract]        
Basic common shares outstanding 68,368 67,893 68,261 67,714
Common stock equivalents 647   366  
Diluted common shares outstanding 69,015 67,893 68,627 67,714
[1] Due to the fact that we reported a loss from continuing operations for the quarter and year to date ended June 30, 2015, 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 and year to date ended June 30, 2015.