STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (USD $)	Man-AHL Diversified I L.P. [Member]	Man-AHL Diversified I L.P. [Member] Limited Partners [Member] Class A Series 1 [Member]	Man-AHL Diversified I L.P. [Member] Limited Partners [Member] Class A Series 2 [Member]	Man-AHL Diversified I L.P. [Member] Limited Partners [Member] Class B Series 1 [Member]	Man-AHL Diversified I L.P. [Member] Limited Partners [Member] Class B Series 2 [Member]	Man-AHL Diversified I L.P. [Member] General Partner [Member] Class A Series 1 [Member]	Man-AHL Diversified Trading Company L.P. [Member]	Man-AHL Diversified Trading Company L.P. [Member] Limited Partners [Member]	Man-AHL Diversified Trading Company L.P. [Member] General Partner [Member]
PARTNERS' CAPITAL at Dec. 31, 2011	$ 527,665,863	$ 356,053,748	$ 51,848,998	$ 105,727,713	$ 13,445,739	$ 589,665	$ 675,495,416	$ 675,495,416
PARTNERS' CAPITAL, units at Dec. 31, 2011	166,078	112,537	15,832	33,417	4,106	186
Subscriptions	39,990,609	26,530,310	515,000	12,540,299	405,000	0	42,557,502	42,557,502
Subscriptions, units	12,824	8,513	160	4,026	125	0		4,114.39
Redemptions	(72,905,599)	(42,350,815)	(9,900,190)	(17,704,353)	(2,950,241)	0	(126,796,338)	(126,796,338)
Redemptions, units	(23,768)	(13,908)	(3,136)	(5,793)	(931)	0		(12,450.99)
Net income (loss)	(36,089,495)	(24,828,663)	(3,044,123)	(7,393,796)	(781,894)	(41,019)	(30,524,213)	(30,524,213)
PARTNERS' CAPITAL at Jun. 30, 2012	458,661,378	315,404,580	39,419,685	93,169,863	10,118,604	548,646	560,732,367	560,732,367
PARTNERS' CAPITAL, units at Jun. 30, 2012	155,134	107,142	12,856	31,650	3,300	186
PARTNERS' CAPITAL at Mar. 31, 2012
Net income (loss)	(17,380,152)						(14,460,101)
PARTNERS' CAPITAL at Jun. 30, 2012	458,661,378						560,732,367
PARTNERS' CAPITAL, units at Jun. 30, 2012	155,134
PARTNERS' CAPITAL at Dec. 31, 2012	379,350,987	258,830,984	33,286,088	78,224,406	8,471,919	537,590	457,308,203	457,308,203
PARTNERS' CAPITAL, units at Dec. 31, 2012	130,849	89,733	11,009	27,119	2,802	186
Subscriptions	8,021,999	5,869,262	0	2,152,737	0	0	9,121,999	9,121,999
Subscriptions, units	2,713	1,982		731				889.29
Redemptions	(81,284,633)	(51,431,247)	(11,484,450)	(10,040,108)	(8,328,828)	0	(109,097,467)	(109,097,467)
Redemptions, units	(27,214)	(17,656)	(3,587)	(3,436)	(2,535)			(10,539.54)
Net income (loss)	(13,290,133)	(10,174,934)	(333,444)	(3,384,505)	629,240	(26,490)	(5,639,569)	(5,639,569)
PARTNERS' CAPITAL at Jun. 30, 2013	292,798,220	203,094,065	21,468,194	66,952,530	772,331	511,100	351,693,166	351,693,166
PARTNERS' CAPITAL, units at Jun. 30, 2013	106,348	74,059	7,422	24,414	267	186
PARTNERS' CAPITAL at Mar. 31, 2013
Net income (loss)	(21,786,475)						(21,216,666)
PARTNERS' CAPITAL at Jun. 30, 2013	$ 292,798,220						$ 351,693,166
PARTNERS' CAPITAL, units at Jun. 30, 2013	106,348