Cash Distributions to Limited Partners - Summary of Cash Distributions Paid to Limited Partners (Detail) (USD $)	1 Months Ended	3 Months Ended												12 Months Ended
	Dec. 31, 2011	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Partners Capital And Distributions [Line Items]
Cash Distribution per Limited Partnership Unit	$ 26.03	$ 4.86	$ 4.68	$ 4.44	$ 3.63	$ 5.03	$ 4.77	$ 4.66	$ 5.06	$ 5.50	$ 5.12	$ 4.46	$ 5.17	$ 17.61	$ 45.55	$ 20.25
Weighted Average Number of Units Outstanding	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261
Number of Units Outstanding at the End of Quarter	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261	47,261