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Stock-Based Compensation - Summary of Restricted Stock Unit and Restricted Performance Stock Unit Activity (Detail)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Number of Options Outstanding  
Number of Options Outstanding, Beginning balance (in shares) | shares 24,000
Number of Options Outstanding, Ending balance (in shares) | shares 24,000
Awards estimated to vest in the future, Outstanding (in shares) | shares 24,000
Weighted Average Exercise Price  
Weighted Average Exercise Price, Beginning balance (in dollars per share) | $ / shares $ 20.39
Weighted Average Exercise Price, Ending balance (in dollars per share) | $ / shares 20.39
Awards estimated to vest in the future (in dollar per share) | $ / shares $ 20.39
Restricted Stock Units [Member]  
Number of Awards  
Number of Awards, Beginning balance (in shares) | shares 1,213,667
Granted (in shares) | shares 1,787
Settled (in shares) | shares (388,504)
Forfeited or expired (in shares) | shares (31,092)
Number of Awards, Ending balance (in shares) | shares 795,858
Awards estimated to vest in the future, Outstanding (in shares) | shares 724,142
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 3.59
Granted (in dollars per share) | $ / shares 5.41
Settled (in dollars per share) | $ / shares 4.05
Forfeited or expired (in dollars per share) | $ / shares 8.25
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares 3.19
Awards estimated to vest in the future (in dollar per share) | $ / shares $ 3.16
Performance Shares Unit [Member]  
Number of Awards  
Number of Awards, Beginning balance (in shares) | shares 2,176,290
Granted (in shares) | shares 21,352
Settled (in shares) | shares (193,778)
Forfeited or expired (in shares) | shares (142,769)
Number of Awards, Ending balance (in shares) | shares 1,861,095
Awards estimated to vest in the future, Outstanding (in shares) | shares 1,341,900
Weighted Average Grant Date Fair Value  
Weighted Average Grant Date Fair Value, Beginning balance (in dollars per share) | $ / shares $ 4.88
Granted (in dollars per share) | $ / shares 5.67
Settled (in dollars per share) | $ / shares 5.45
Forfeited or expired (in dollars per share) | $ / shares 12.96
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share) | $ / shares 6.05
Awards estimated to vest in the future (in dollar per share) | $ / shares $ 6.09