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Stock-based Compensation - Summary of Restricted Stock Units (Detail)
3 Months Ended
Mar. 31, 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 (342,084)
Number of Shares, Forfeited or expired | shares (1,556)
Number of Shares, Outstanding, Ending Balance | shares 395,682
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 6.90
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 8.03
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.52
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 (37,080)
Number of Shares, Outstanding, Ending Balance | shares 222,338
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 6.83
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 8.94