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Stock-Based Compensation - Summary of Restricted Stock Units (Detail)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Time-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 920,024
Number of Shares, Granted | shares 109,250
Number of Shares, Vested | shares (358,874)
Number of Shares, Forfeited or expired | shares (5,212)
Number of Shares, Outstanding, Ending Balance | shares 665,188
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.60
Weighted-Average Grant Date Fair Value, Granted | $ / shares 8.08
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.78
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 9.87
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.38
Performance-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 613,605
Number of Shares, Vested | shares (262,685)
Number of Shares, Forfeited or expired | shares (15,332)
Number of Shares, Outstanding, Ending Balance | shares 335,588
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.44
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.90
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 9.86
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.46