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Summary of the Organization, Description of Business and Significant Accounting Policies - Schedule of Contingent Payment Due Under Asset (Detail) (USD $)
 0 Months Ended 12 Months Ended
Nov. 05, 2013
Sep. 30, 2013
Acquired Indefinite-lived Intangible Assets [Line Items]    
Management contracts, Beginning balance   $ 22,557,186
Capitalized transaction costs in current year   988,100
Management contracts, Ending balance   62,431,018
Contingent purchase price payment allocation:    
Current portion   7,567,712
Long-term portion   11,625,883
Total   19,193,595
FBR Funds [Member]
    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Initial purchase price for assets related to management of the FBR Funds   19,692,137
Contingent purchase price for assets related to management of the FBR Funds   19,193,595
Contingent purchase price payment allocation:    
Long-term portion   11,625,883
Total $ 19,193,595