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Stock-Based Compensation - Equity Awards Outstanding and Exercisable (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Options Outstanding    
Options, Outstanding at beginning of period 1,421,520  
Options, Granted 50,000  
Options, Exercised (72,431)  
Options, Forfeited (43,194)  
Options, Outstanding at end of period 1,355,895 1,421,520
Options, Weighted Average Exercise Price    
Options, Weighted Average Exercise Price, at beginning of period $ 11.02  
Options, Weighted Average Exercise Price, Granted $ 27.48  
Options, Weighted Average Exercise Price, Exercised $ 6.55  
Options, Weighted Average Exercise Price, Forfeited $ 13.11  
Options, Weighted Average Exercise Price, at end of period $ 11.80 $ 11.02
Options, Weighted Average Remaining Term    
Options, Weighted Average Remaining Term at the end of the period 6 years 7 months 17 days 6 years 11 months 5 days
Restricted Stock Units, shares    
Restricted Stock Units, shares at beginning of period 1,351,655  
Restricted Stock Units, shares, Granted 1,301,015  
Restricted Stock Units, shares, Exercised (224,235)  
Restricted Stock Units, shares, Forfeited (84,005)  
Restricted Stock Units, shares at end of period 2,344,430 1,351,655
Restricted Stock, Weighted Average Grant Date Fair Value    
Restricted Stock, Weighted Average Grant Date Fair Value at beginning of period $ 13.26  
Restricted Stock, Weighted Average Grant Date Fair Value, Granted $ 25.44  
Restricted Stock, Weighted Average Grant Date Fair Value, Exercised $ 13.56  
Restricted Stock, Weighted Average Grant Date Fair Value, Forfeited $ 13.97  
Restricted Stock, Weighted Average Grant Date Fair Value at end of period $ 19.96 $ 13.26
Minimum [Member]
   
Options, Weighted Average Exercise Price    
Options, Weighted Average Exercise Price, at beginning of period $ 2.28  
Options, Weighted Average Exercise Price, Granted $ 23.31  
Options, Weighted Average Exercise Price, Exercised $ 2.96  
Options, Weighted Average Exercise Price, Forfeited $ 10.53  
Options, Weighted Average Exercise Price, at end of period $ 2.28  
Maximum [Member]
   
Options, Weighted Average Exercise Price    
Options, Weighted Average Exercise Price, at beginning of period $ 23.19  
Options, Weighted Average Exercise Price, Granted $ 31.28  
Options, Weighted Average Exercise Price, Exercised $ 16.98  
Options, Weighted Average Exercise Price, Forfeited $ 17.10  
Options, Weighted Average Exercise Price, at end of period $ 31.28