Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 13, 2015
Subsequent Event [Line Items]
Partnership made distributions to the Limited Partners	$ 857,000	$ 1,680,000	$ 1,285,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Limited Partners interest				$ 12.96
Partnership made distributions to the Limited Partners				$ 600,000