Schedule of Expected Future Amortization of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2015 (remaining) $ 4,387  
2016 5,931  
2017 5,921  
2018 5,973  
2019 6,011  
Thereafter 48,742  
Net Carrying Amount $ 76,965 $ 78,385