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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, 2015
$ / shares
shares
Shares  
Number of Awards, Beginning balance (in shares) | shares 185,679
Number of Awards, Granted (in shares) | shares 445,485
Number of Awards, Vested (in shares) | shares (11,260)
Number of Awards, Forfeited (in shares) | shares (12,614)
Number of Awards, Ending balance (in shares) | shares 607,290
Weighted Average Grant Date Fair Value  
Weighted Average Grand Date Fair Value, Outstanding, Beginning balance (usd per share) $ 24.19
Weighted Average Grand Date Fair Value, Granted (usd per share) 18.46
Weighted Average Grand Date Fair Value, Vested (usd per share) 22.98
Weighted Average Grand Date Fair Value, Forfeited (usd per share) 22.29
Weighted Average Grand Date Fair Value, Outstanding, Ending balance (usd per share) $ 20.03