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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]      
Rent expenses $ 4,455us-gaap_OperatingLeasesRentExpenseNet $ 2,325us-gaap_OperatingLeasesRentExpenseNet $ 2,375us-gaap_OperatingLeasesRentExpenseNet
Possible loss estimated minimum 0us-gaap_LossContingencyRangeOfPossibleLossMinimum    
Possible loss estimated maximum 6,000us-gaap_LossContingencyRangeOfPossibleLossMaximum    
Amount accrued for estimation of loss 0us-gaap_LossContingencyAccrualCarryingValueCurrent    
Recognized loss contingency $ 0us-gaap_LossContingencyAccrualAtCarryingValue $ 200us-gaap_LossContingencyAccrualAtCarryingValue