Document and Entity Information	3 Months Ended
	Mar. 31, 2012	Apr. 01, 2012 Systematic Strategies Portfolio [Member]	Apr. 01, 2012 Blended Strategies Portfolio [Member]
Entity Information [Line Items]
Entity Registrant Name	GRAHAM ALTERNATIVE INVESTMENT FUND II LLC
Entity Central Index Key	0001461237
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		274,577.855	1,219,148.309
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2012