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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock and Unvested Restricted Stock Award Activity (Parenthetical) (Detail) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2016
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock units outstanding related to discontinued operations 296,034
Discontinued Operations [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock units outstanding related to discontinued operations 89,000