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Stock-based Compensation - Summary of Restricted Stock Units (Detail)
9 Months Ended
Sep. 30, 2016
$ / 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 366,004
Number of Shares, Granted | shares 215,195
Number of Shares, Vested | shares (75,970)
Number of Shares, Forfeited or expired | shares (12,534)
Number of Shares, Outstanding, Ending Balance | shares 492,695
Weighted-Average Grant Date Fair Value | $ / shares $ 6.63
Weighted-Average Grant Date Fair Value, Granted | $ / shares 9.38
Weighted-Average Grant Date Fair Value, Vested | $ / shares 6.44
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 6.78
Weighted-Average Grant Date Fair Value | $ / shares $ 7.86
Performance-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 499,369
Number of Shares, Vested | shares (175,389)
Number of Shares, Forfeited or expired | shares (72,792)
Number of Shares, Outstanding, Ending Balance | shares 251,188
Weighted-Average Grant Date Fair Value | $ / shares $ 6.66
Weighted-Average Grant Date Fair Value, Vested | $ / shares 6.53
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 6.58
Weighted-Average Grant Date Fair Value | $ / shares $ 6.66