Document and Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2013 Systematic Strategies Portfolio [Member]	Apr. 01, 2013 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		158,744.076	787,382.027
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013