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Stock Benefit Plans and Stock-Based Compensation - Summary of Information about Restricted Stock Awards, Restricted Stock Units and Performance-Based Restricted Units Activity (Detail) - Restricted Stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, Unvested beginning balance 1,092  
Shares, Awarded 1,517  
Shares, Vested (258)  
Shares, Forfeited (351)  
Shares, Unvested ending balance 2,000 1,092
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted average grant date fair value, Unvested beginning balance $ 7.48  
Weighted average grant date fair value, Awarded 2.96 $ 5.79
Weighted average grant date fair value, Vested 5.07  
Weighted average grant date fair value, Forfeited 8.90  
Weighted average grant date fair value, Unvested ending balance $ 3.65 $ 7.48
Weighted average remaining recognition period, Unvested beginning balance 2 years 9 months 10 days 3 years 7 days