Organization and Limited Partnership Matters - Additional Information (Detail) (USD $)	1 Months Ended		9 Months Ended
	Nov. 27, 1998	Jan. 07, 1997	Sep. 30, 2012	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Partnership business cessation date			Dec. 31, 2017
Public offering of Limited Partnership Units		15,000,000
Public offering of Limited Partnership Units, price per unit		$ 10
Sale of Limited Partnership Units, number of units		120,000
Proceeds from sale of Limited Partnership Units		$ 1,200,000
Gross contributions	150,000,000
Gross contributions, number of units	15,000,000
Initial Partners' capital investment	500
AFS' capital investment	$ 100
Units issued			14,985,550	14,985,550
Units outstanding			14,985,550	14,985,550
Reinvestment period	6 years