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Stock Benefit Plans, Stock-Based Compensation and Equity Transactions - 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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares, Unvested beginning balance 260    
Shares, Awarded 969    
Shares, Vested (64)    
Shares, Forfeited (73)    
Shares, Unvested ending balance 1,092 260  
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 $ 16.91    
Weighted average grant date fair value, Awarded 5.79 $ 16.11 $ 16.62
Weighted average grant date fair value, Vested 9.73    
Weighted average grant date fair value, Forfeited 16.65    
Weighted average grant date fair value, Unvested ending balance $ 7.48 $ 16.91  
Weighted average remaining recognition period, Unvested beginning balance 3 years 7 days 1 year 5 months 23 days