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Stock Based Compensation - Summary of Restricted Stock Unit and Performance Based Restricted Stock Unit Activity (Detail) - Restricted Stock Units and Performance Based Restricted Stock Units [Member]
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Shares  
Number of Awards, Beginning balance (in shares) | shares 441,296
Number of Awards, Granted (in shares) | shares 1,087,007
Number of Awards, Vested (in shares) | shares (13,787)
Number of Awards, Forfeited (in shares) | shares (48,769)
Number of Awards, Ending balance (in shares) | shares 1,465,747
Weighted Average Grant Date Fair Value  
Weighted Average Grand Date Fair Value, Outstanding, Beginning balance (usd per share) | $ / shares $ 13.55
Weighted Average Grand Date Fair Value, Granted (usd per share) | $ / shares 11.39
Weighted Average Grand Date Fair Value, Vested (usd per share) | $ / shares 19.66
Weighted Average Grand Date Fair Value, Forfeited (usd per share) | $ / shares 13.45
Weighted Average Grand Date Fair Value, Outstanding, Ending balance (usd per share) | $ / shares $ 13.38