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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2018
Loss Contingencies [Line Items]        
Operating Leases, Rent Expense $ 2,466 $ 2,717 $ 3,008  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 5,651      
Litigation Settlement, Amount Awarded from Other Party     $ 995,000  
Operating Leases, Future Minimum Payments, Due in Two Years 2,101      
Operating Leases, Future Minimum Payments, Due in Three Years 1,562      
Operating Leases, Future Minimum Payments, Due in Four Years 1,565      
Operating Leases, Future Minimum Payments, Due in Five Years 1,568      
Operating Leases, Future Minimum Payments, Due Thereafter 10,167      
Operating Leases, Future Minimum Payments Due 22,614      
Gain Contingency, Unrecorded Amount       $ 1,400,000
Citigroup [Domain]        
Loss Contingencies [Line Items]        
Gain Contingency, Unrecorded Amount 285,000      
Goldman Sachs [Domain]        
Loss Contingencies [Line Items]        
Gain Contingency, Unrecorded Amount 272,000      
Proceeds from Legal Settlements 26,721      
Other Party [Domain]        
Loss Contingencies [Line Items]        
Gain Contingency, Unrecorded Amount $ 2,550