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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 |

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