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Stock-based Compensation - Summary of Restricted Stock Units (Detail)
6 Months Ended
Jun. 30, 2017
$ / 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 691,952
Number of Shares, Granted | shares 47,370
Number of Shares, Vested | shares (352,084)
Number of Shares, Forfeited or expired | shares (4,559)
Number of Shares, Outstanding, Ending Balance | shares 382,679
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 8.28
Weighted-Average Grant Date Fair Value, Granted | $ / shares 8.59
Weighted-Average Grant Date Fair Value, Vested | $ / shares 6.99
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 8.78
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.51
Performance-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 473,608
Number of Shares, Vested | shares (214,190)
Number of Shares, Forfeited or expired | shares (40,082)
Number of Shares, Outstanding, Ending Balance | shares 219,336
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 7.80
Weighted-Average Grant Date Fair Value, Vested | $ / shares 6.78
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 7.01
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 8.94