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Stock-based Compensation - Summary of Restricted Stock Units (Detail)
3 Months Ended
Mar. 31, 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 132,945
Number of Shares, Vested | shares (75,470)
Number of Shares, Forfeited or expired | shares (4,055)
Number of Shares, Outstanding, Ending Balance | shares 419,424
Weighted-Average Grant Date Fair Value | $ / shares $ 6.63
Weighted-Average Grant Date Fair Value, Granted | $ / shares 7.64
Weighted-Average Grant Date Fair Value, Vested | $ / shares 6.41
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 6.78
Weighted-Average Grant Date Fair Value | $ / shares $ 6.99
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 (64,315)
Number of Shares, Outstanding, Ending Balance | shares 259,665
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 6.55
Weighted-Average Grant Date Fair Value | $ / shares $ 6.66