STATEMENTS OF FINANCIAL CONDITION (USD $)	Jun. 30, 2013	Dec. 31, 2012
Man-AHL Diversified Trading Company L.P. [Member]
ASSETS
Net unrealized trading gains on open futures contracts	$ 2,371,914	$ 4,050,440
Net unrealized trading gains on open forward contracts	3,407,007	5,510,378
Net unrealized trading gains on open swap agreements	5,099,915	431,271
Due from brokers	79,052,479	103,608,382
Total equity in trading accounts	89,931,315	113,600,471
Cash	296,837,464	372,563,159
Interest receivable	11,664	0
Total assets	386,780,443	486,163,630
LIABILITIES:
Net unrealized trading losses on open futures contracts	2,489,701	2,817,349
Net unrealized trading losses on open swap agreements	9,821,978	759,721
Premiums received on credit default swap agreements	5,807,215
Redemptions payable	16,880,237	25,150,262
Accrued expenses and other liabilities	88,146	128,095
Total liabilities	35,087,277	28,855,427
PARTNERS' CAPITAL:
Limited Partners	351,693,166	457,308,203
Total partners' capital	351,693,166	457,308,203
Total liabilities and partners' capital	386,780,443	486,163,630
NET ASSET VALUE PER OUTSTANDING UNIT OF PARTNERSHIP INTEREST	9,691.97	9,955.05
Man-AHL Diversified I L.P. [Member]
ASSETS
Investment in Man-AHL Diversified Trading Company L.P.	292,797,727	379,350,987
Due from Man-AHL Diversified Trading Company L.P.	14,103,161	21,770,073
Cash	3,907,601	961,791
Total assets	310,808,489	402,082,851
LIABILITIES:
Redemptions payable	12,749,751	20,073,796
Subscriptions received in advance	3,907,601	916,841
Management fees payable	747,698	965,924
Servicing fees payable	378,596	492,005
Accrued expenses and other liabilities	226,623	283,298
Total liabilities	18,010,269	22,731,864
PARTNERS' CAPITAL:
Total partners' capital	292,798,220	379,350,987
Total liabilities and partners' capital	310,808,489	402,082,851
Man-AHL Diversified I L.P. [Member] | Class A Series 1 [Member]
PARTNERS' CAPITAL:
Limited Partners	203,094,065	258,830,984
General Partner	511,100	537,590
NET ASSET VALUE PER OUTSTANDING UNIT OF PARTNERSHIP INTEREST	2,742.34	2,884.47
Man-AHL Diversified I L.P. [Member] | Class A Series 2 [Member]
PARTNERS' CAPITAL:
Limited Partners	21,468,194	33,286,088
NET ASSET VALUE PER OUTSTANDING UNIT OF PARTNERSHIP INTEREST	2,892.50	3,023.40
Man-AHL Diversified I L.P. [Member] | Class B Series 1 [Member]
PARTNERS' CAPITAL:
Limited Partners	66,952,530	78,224,406
NET ASSET VALUE PER OUTSTANDING UNIT OF PARTNERSHIP INTEREST	2,742.34	2,884.48
Man-AHL Diversified I L.P. [Member] | Class B Series 2 [Member]
PARTNERS' CAPITAL:
Limited Partners	$ 772,331	$ 8,471,919
NET ASSET VALUE PER OUTSTANDING UNIT OF PARTNERSHIP INTEREST	2,892.54	3,023.42