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Stock-Based Compensation - Summary of Restricted Stock Units (Detail)
9 Months Ended
Sep. 30, 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 130,496
Number of Shares, Vested | shares (452,379)
Number of Shares, Forfeited or expired | shares (38,467)
Number of Shares, Outstanding, Ending Balance | shares 559,674
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.60
Weighted-Average Grant Date Fair Value, Granted | $ / shares 7.84
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.84
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 8.93
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.15
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, Granted | shares 12,246
Number of Shares, Vested | shares (262,685)
Number of Shares, Forfeited or expired | shares (29,970)
Number of Shares, Outstanding, Ending Balance | shares 333,196
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.44
Weighted-Average Grant Date Fair Value, Granted | $ / shares 7.90
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.90
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 9.46
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 8.92