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Summary of Restricted Stock and RSU Activity (Detail) - Restricted Stock And Restricted Stock Units - USD ($)
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning Balance 542,342  
Granted 285,247  
Vested and settled (52,421)  
Forfeited (33,500)  
Ending Balance 741,668  
Outstanding - Vested but not released 103,423  
Outstanding - Unvested 638,245  
Beginning Balance $ 13.74  
Granted 12.34  
Vested and settled 14.53  
Forfeited 10.74  
Ending Balance $ 13.28  
Weighted Average Remaining Contractual Term 1 year 4 months 10 days  
Average Intrinsic Value $ 2,588,423 $ 7,533,132