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Significant Accounting Policies (Tables)

12 Months Ended

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