STATEMENTS OF OPERATIONS (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Man-AHL Diversified I L.P. [Member]
NET INVESTMENT LOSS ALLOCATED FROM MAN-AHL DIVERSIFIED TRADING COMPANY L.P.:
Interest income	$ 53,104	$ 97,725	$ 103,741	$ 147,265
Brokerage commissions	(244,876)	(181,890)	(444,371)	(347,480)
Other expenses	(62,646)	(114,984)	(196,284)	(213,801)
Net investment loss allocated from Man-AHL Diversified Trading Company L.P.	(254,418)	(199,149)	(536,914)	(414,016)
PARTNERSHIP EXPENSES:
Management fees	2,462,098	3,587,407	5,203,989	7,404,851
Servicing fees	1,249,690	1,828,921	2,646,716	3,777,767
Administration fees	111,890	156,646	233,115	321,291
Professional fees	55,000	68,262	110,000	124,525
Other expenses	46,752	24,465	86,935	42,886
Total expenses	3,925,430	5,665,701	8,280,755	11,671,320
Net investment loss	(4,179,848)	(5,864,850)	(8,817,669)	(12,085,336)
REALIZED AND UNREALIZED GAINS (LOSSES) ON TRADING ACTIVITIES:
Net realized trading gains (losses) on closed contracts/agreements and foreign currency transactions	(13,593,869)	(10,327,652)	2,661,769	(4,481,254)
Net change in unrealized trading gains (losses) on open contracts/agreements and translation of foreign currency	(4,012,758)	(1,187,650)	(7,134,233)	(19,522,905)
Net loss on trading activities	(17,606,627)	(11,515,302)	(4,472,464)	(24,004,159)
NET LOSS	(21,786,475)	(17,380,152)	(13,290,133)	(36,089,495)
Man-AHL Diversified I L.P. [Member] | Class A Series 1 [Member]
REALIZED AND UNREALIZED GAINS (LOSSES) ON TRADING ACTIVITIES:
NET LOSS PER UNIT OF PARTNERSHIP INTEREST	(206.78)	(108.74)	(142.13)	(220.09)
Man-AHL Diversified I L.P. [Member] | Class A Series 2 [Member]
REALIZED AND UNREALIZED GAINS (LOSSES) ON TRADING ACTIVITIES:
NET LOSS PER UNIT OF PARTNERSHIP INTEREST	(208.37)	(103.31)	(130.90)	(208.65)
Man-AHL Diversified I L.P. [Member] | Class B Series 1 [Member]
REALIZED AND UNREALIZED GAINS (LOSSES) ON TRADING ACTIVITIES:
NET LOSS PER UNIT OF PARTNERSHIP INTEREST	(206.79)	(108.74)	(142.14)	(220.09)
Man-AHL Diversified I L.P. [Member] | Class B Series 2 [Member]
REALIZED AND UNREALIZED GAINS (LOSSES) ON TRADING ACTIVITIES:
NET LOSS PER UNIT OF PARTNERSHIP INTEREST	(208.34)	(103.31)	(130.88)	(208.64)
Man-AHL Diversified Trading Company L.P. [Member]
NET INVESTMENT LOSS ALLOCATED FROM MAN-AHL DIVERSIFIED TRADING COMPANY L.P.:
Interest income	63,984	122,309	125,405	185,404
PARTNERSHIP EXPENSES:
Brokerage commissions	294,631	227,546	536,652	438,681
Interest expense-brokers	22,673	82,178	135,026	150,387
Administration fees	2,500	2,500	5,000	5,000
Professional fees	37,156	51,811	74,312	101,936
Other expenses	13,064	7,496	23,648	12,682
Total expenses	370,024	371,531	774,638	708,686
Net investment loss	(306,040)	(249,222)	(649,233)	(523,282)
REALIZED AND UNREALIZED GAINS (LOSSES) ON TRADING ACTIVITIES:
Net realized trading gains (losses) on closed contracts/agreements and foreign currency transactions	(16,332,693)	(13,118,697)	3,384,679	(5,602,534)
Net change in unrealized gains (losses) on translation of foreign currency	199,901	(608,583)	(527,153)	54,035
Net change in unrealized trading gains (losses) on open contracts/agreements and translation of foreign currency	(4,777,834)	(483,599)	(7,847,862)	(24,452,432)
Net loss on trading activities	(20,910,626)	(14,210,879)	(4,990,336)	(30,000,931)
NET LOSS	$ (21,216,666)	$ (14,460,101)	$ (5,639,569)	$ (30,524,213)
NET LOSS PER UNIT OF PARTNERSHIP INTEREST	(607.48)	(246.08)	(263.08)	(494.17)