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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
Mar. 31, 2016
Mar. 31, 2015
 [1]
Earnings Per Share [Abstract]    
Basic common shares outstanding 68,155 67,534
Common stock equivalents 643  
Diluted common shares outstanding 68,798 67,534
[1] Due to the fact that we reported a loss from continuing operations for the quarter ended March 31, 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 ended March 31, 2015.