Consolidated Statements of Partners' Capital (USD $)	General Partner Capital [Member]	Limited Partners' Capital [Member]	Total OMIF Partners' Capital [Member]	Noncontrolling Interest [Member]	Total
Balances at Dec. 31, 2010	$ 2,259,916	$ 216,841,448	$ 219,101,364	$ 16,467	$ 219,117,831
Balances (in Shares) at Dec. 31, 2010		290,019,136
Net (loss) income	(274,408)	(24,469,847)	(24,744,255)	1,129,202	(23,615,053)
Net (loss) income (in Shares)		55,745
Noncontrolling interests of newly consolidated LLC’s				16,257,427	16,257,427
Contribution from noncontrolling interest				135,944	135,944
Partners’ capital distributions	(118,344)	(11,469,357)	(11,587,701)		(11,587,701)
Partners’ capital distributions (in Shares)		(11,469,357)
Partners’ income distributions	(18,171)	(1,705,278)	(1,723,449)	(19,212)	(1,742,661)
Balances, December 31, 2012 at Dec. 31, 2011	1,848,993	179,196,966	181,045,959	17,519,828	198,565,787
Balances, December 31, 2012 (in Shares) at Dec. 31, 2011		278,605,524
Net (loss) income	(17,120)	(1,662,700)	(1,679,820)	510,586	(1,169,234)
Change in ownership interests in consolidated LLC (Note 6)	28,150	2,731,617	2,759,767	(9,959,767)	(7,200,000)
Partners’ income distributions	(19,993)	(1,937,518)	(1,957,511)	(21,347)	(1,978,858)
Balances, December 31, 2012 at Dec. 31, 2012	$ 1,840,030	$ 178,328,365	$ 180,168,395	$ 8,049,300	$ 188,217,695
Balances, December 31, 2012 (in Shares) at Dec. 31, 2012		278,605,524