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Management Contracts Purchased - Additional Information (Detail)
 3 Months Ended
Nov. 05, 2013
USD ($)
Oct. 28, 2013
USD ($)
Oct. 26, 2012
USD ($)
Funds
Sep. 30, 2013
USD ($)
Jun. 30, 2015
Funds
Contracts In Progress Costs And Earnings [Line Items]          
Number of mutual funds | Funds         13
Number of funds acquired | Funds     10    
Acquisition of FBR & Co. (FBRC) deal     $ 2,200,000,000    
Additional loan borrowed   $ 16,300,000      
Payments to acquire management contract rights through available cash   3,400,000      
FBR Funds [Member]          
Contracts In Progress Costs And Earnings [Line Items]          
Initial payment based upon the net asset value of the FBR Funds     $ 19,692,137    
Contingent payment based upon the net asset value of the FBR Funds $ 19,193,595        
Additional loan borrowed       $ 13,286,666  
Contingent payment due under the asset purchase agreement   $ 19,193,595