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Stock-Based Compensation - Summary of Restricted Performance Stock Unit and Equity Incentive Activity (Detail)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Number of Options Outstanding  
Number of Options Outstanding, Beginning balance (in shares) | shares 59,000
Number of Options Outstanding, Ending balance (in shares) | shares 59,000
Options vested or expected to vest, Outstanding (in shares) | shares 59,000
Weighted Average Exercise Price  
Weighted Average Exercise Price, Beginning balance (in dollars per share) | $ / shares $ 18.33
Weighted Average Exercise Price, Ending balance (in dollars per share) | $ / shares 18.33
Vested or expected to vest (in dollar per share) | $ / shares $ 18.33
Restricted Stock Units [Member]  
Number of Awards  
Number of Awards, Beginning balance (in shares) | shares 183,726
Granted (in shares) | shares 294,629
Settled (in shares) | shares (42,699)
Forfeited or expired (in shares) | shares (18,975)
Number of Awards, Ending balance (in shares) | shares 416,681
Number of Awards, vested or expected to vest, Outstanding (in shares) | shares 354,475
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 17.26
Granted (in dollars per share) | $ / shares 5.41
Settled (in dollars per share) | $ / shares 18.42
Forfeited or expired (in dollars per share) | $ / shares 15.79
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares 8.83
Vested or expected to vest (in dollar per share) | $ / shares $ 9.13
Performance Shares Unit [Member]  
Number of Awards  
Number of Awards, Beginning balance (in shares) | shares 296,523
Granted (in shares) | shares 489,261
Settled (in shares) | shares (31,081)
Forfeited or expired (in shares) | shares (53,396)
Number of Awards, Ending balance (in shares) | shares 701,307
Number of Awards, vested or expected to vest, Outstanding (in shares) | shares 422,761
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 19.1
Granted (in dollars per share) | $ / shares 6.28
Settled (in dollars per share) | $ / shares 22.81
Forfeited or expired (in dollars per share) | $ / shares 18.02
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares 10.05
Vested or expected to vest (in dollar per share) | $ / shares $ 8.69