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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Significant Accounting Policies [Abstract] |
Summary of investments values based upon Level 1 and Level 2 |
|  | As of December 31, |
|  | 2012 |  |  | 2011 |
Level 1 Inputs |  | $ | 16,922,720 |  |  | $ | 10,480,353 |
Level 2 Inputs |  |  | 3,650,561 |  |  |  | 6,977,929 |
Assets under management (AUM) subject to incentive fees and the incentive fees |
|  | As of December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
AUM Contractual Period Ends: |  |  |  |  |  |  |  |  |  |  |  |
Calendar Quarter-End |  | $ | — |  |  | $ | 89,070,421 |  |  | $ | 108,671,900 |
Calendar Year-End |  |  | — |  |  |  | 81,362,029 |  |  |  | 175,231,841 |
May 31, 2017 |  |  | 274,302,549 |  |  |  | — |  |  |  | — |
Total AUM Subject to Incentive Fees |  | $ | 274,302,549 |  |  | $ | 170,432,450 |  |  | $ | 283,903,741 |
|  | For the Year Ending December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Incentive Fees Under Method 1— |  |  |  |  |  |  |  |  |  |  |  |
Contractual Period Ends: |  |  |  |  |  |  |  |  |  |  |  |
Calendar Quarter-End |  | $ | — |  |  | $ | 507 |  |  | $ | 13,214 |
Calendar Year-End |  |  | — |  |  |  | 2,090 |  |  |  | 204,374 |
May 31, 2017 |  |  | 3,301 |  |  |  | — |  |  |  | — |
Total Incentive Fees Under Method 1 |  | $ | 3,301 |  |  | $ | 2,597 |  |  | $ | 217,588 |
Incentive Fees Under Method 2— |  |  |  |  |  |  |  |  |  |  |  |
Contractual Period Ends: |  |  |  |  |  |  |  |  |  |  |  |
Calendar Quarter-End |  | $ | — |  |  | $ | 507 |  |  | $ | 13,214 |
Calendar Year-End |  |  | — |  |  |  | 2,090 |  |  |  | 204,374 |
May 31, 2017 |  |  | 361,700 |  |  |  | — |  |  |  | — |
Total Incentive Fees Under Method 2 |  | $ | 361,700 |  |  | $ | 2,597 |  |  | $ | 217,588 |
Compensation for mutual fund administration, transfer agency and other related functions |
|  | Prior to February 29, |  |  | After February 29, |
|  | 2012 |  |  | 2012 |
Class A and Class C |  |  | 0.26 | % |  |  | 0.25 | %
Class I |  |  | 0.24 | % |  |  | 0.25 | %
Class Y (a) |  |  | 0.10 | % |  |  | 0.10 | %
(a) | Class Y commenced operations on January 3, 2012.
Mutual fund administration gross and net revenue |
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Mutual fund administration: |  |  |  |  |  |  |  |  |  |  |  |
Administration revenue, gross |  | $ | 13,074,707 |  |  | $ | 11,617,140 |  |  | $ | 10,940,041 |
12b-1/service fees and commission revenue received from fund clients |  |  | 6,868,974 |  |  |  | 7,058,471 |  |  |  | 8,122,268 |
12b-1/service fees and commission expense payments to third parties |  |  | (5,597,757 | ) |  |  | (5,577,925 | ) |  |  | (6,641,308 | )
Fund related expense |  |  | (5,521,541 | ) |  |  | (5,311,523 | ) |  |  | (5,035,116 | )
Revenue, net of fund related expenses |  |  | 8,824,383 |  |  |  | 7,786,163 |  |  |  | 7,385,885 |
DHCM C-Share financing: |  |  |  |  |  |  |  |  |  |  |  |
Broker commission advance repayments |  |  | 217,227 |  |  |  | 352,740 |  |  |  | 619,490 |
Broker commission amortization |  |  | (219,951 | ) |  |  | (317,137 | ) |  |  | (549,838 | )
Financing activity, net |  |  | (2,724 | ) |  |  | 35,603 |  |  |  | 69,652 |
Mutual fund administration revenue, net |  | $ | 8,821,659 |  |  | $ | 7,821,766 |  |  | $ | 7,455,537 |

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