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Commitments and Other Contingencies (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leased Assets [Line Items]      
Operating lease future payments, 2018 $ 1,313    
Operating lease future payments, 2019 208    
Operating lease future payments, 2020 180    
Operating lease future payments, 2021 61    
Operating lease future payments, 2022 0    
Operating lease future payments, thereafter 0    
Debt 108,429 $ 110,358  
Office Facilities And Other Equipment      
Operating Leased Assets [Line Items]      
Lease expense 2,101 $ 1,923 $ 3,872
Other Office Locations      
Operating Leased Assets [Line Items]      
Remaining contractual obligation 1,762    
Surety Bond      
Operating Leased Assets [Line Items]      
Principal amount of debt 40,000    
Debt $ 14,708