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Stockholders' Equity - Summary of Outstanding RSUs (Detail)
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Restricted Stock Units | Performance-based RSUs  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Beginning Balance (shares) 393,084
Granted (shares) 334,035
Vested (shares) 0
Forfeited (shares) (8,489)
Ending Balance (shares) 718,630
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Beginning Balance, Weighted Average Grant Date Fair Value (usd per share) | $ / shares $ 18.54
Granted, Weighted Average Grant Date Fair Value (usd per share) | $ / shares 16.47
Vested, Weighted Average Grant Date Fair Value (usd per share) | $ / shares 0.00
Forfeited, Weighted Average Grant Date Fair Value (usd per share) | $ / shares 17.72
Ending Balance, Weighted Average Grant Date Fair Value (usd per share) | $ / shares $ 17.59
Restricted Stock and Restricted Stock Units (RSUs) | 2011 Long Term Incentive Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested and Not Expected to Vest, Number 99,451
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-average period over which cost is expected to be recognized 2 years 15 days