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Stockholders’ Equity (Detail) - Restricted Stock Unit Activity - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested units, beginning balance (in shares) 2,520,000  
Non-vested units, ending balance (in shares) 2,645,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Non-vested units, beginning balance (in dollars per share) $ 11.95  
Non-vested units, ending balance (in dollars per share) $ 12.15  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, intrinsic value $ 28,273  
PBRSUs and RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3,600 $ 2,700
Restricted stock units granted    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 648,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Granted (in dollars per share) $ 13.43  
Restricted stock units vested    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Vested (in shares) (413,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Vested (in dollars per share) $ 12.42  
Restricted stock units forfeited    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Forfeited (in shares) (110,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Forfeited (in dollars per share) $ 11.93