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Stock-Based Compensation - Summary of Restricted Stock Units (Detail)
12 Months Ended
Dec. 31, 2018
$ / 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 818,480
Number of Shares, Granted | shares 606,249
Number of Shares, Vested | shares (432,189)
Number of Shares, Forfeited or expired | shares (72,516)
Number of Shares, Outstanding, Ending Balance | shares 920,024
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.95
Weighted-Average Grant Date Fair Value, Granted | $ / shares 9.44
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.32
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 10.46
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.60
Performance-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 444,734
Number of Shares, Granted | shares 387,748
Number of Shares, Vested | shares (168,068)
Number of Shares, Forfeited or expired | shares (50,809)
Number of Shares, Outstanding, Ending Balance | shares 613,605
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.48
Weighted-Average Grant Date Fair Value, Granted | $ / shares 9.15
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.16
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 9.41
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.44