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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Jan. 14, 2016
Dec. 31, 2015
Jan. 08, 2016
Nov. 30, 2015
Feb. 28, 2015
Subsequent Event [Line Items]          
Trading investments, at fair value       $ 754 $ 2,516
Subsequent Event          
Subsequent Event [Line Items]          
Trading investments, at fair value     $ 244    
Subsequent Event | Chief Executive Officer          
Subsequent Event [Line Items]          
Proceeds from notes payable   $ 250      
Repayments of notes payable $ 250