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Significant Accounting Policies - Mutual Fund Administration Gross and Net Revenue (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Mutual fund administration: |  |  |  |
Administration revenue, gross | $ 6,074,294 | $ 4,320,959 | $ 16,682,792 | $ 11,951,844
12b-1/service fees and commission revenue received from fund clients | 2,691,398 | 2,277,421 | 7,862,662 | 6,074,489
12b-1/service fees and commission expense payments to third parties | (2,315,084) | (1,992,664) | (6,814,493) | (5,319,674)
Fund related expense | (2,545,768) | (1,632,500) | (7,054,512) | (4,392,723)
Revenue, net of fund related expenses | 3,904,840 | 2,973,216 | 10,676,449 | 8,313,936
DHCM C-Share financing: |  |  |  |
Broker commission advance repayments | 235,054 | 100,003 | 627,052 | 221,335
Broker commission amortization | (222,430) | (96,998) | (607,631) | (213,888)
Financing activity, net | 12,624 | 3,005 | 19,421 | 7,447
Mutual fund administration revenue, net | $ 3,917,464 | $ 2,976,221 | $ 10,695,870 | $ 8,321,383

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- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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