Partners' Capital - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Limited Partners' Capital Account [Line Items]
Limited Partners capital account, units issued	14,985,550	14,985,550
Limited Partners capital account, units outstanding	14,985,550	14,985,550
Limited Partners capital account, units authorized	15,000,050	15,000,050
Potential Repurchase Price of Units as Percentage of Holder's Capital Account	100.00%
Limited Partner
Limited Partners' Capital Account [Line Items]
Allocation of Net Income, Net Losses, and Distributions	92.50%
Limited Partner | First
Limited Partners' Capital Account [Line Items]
Percentage of cash distributions from operations	88.50%
Percentage of cash distributions from operations as annual return on invested capital	10.00%
Percentage of cash distributions from sales or refinancing	92.50%
Percentage of cash distributions from sales or refinancing as annual return on invested capital	10.00%
Limited Partner | Second
Limited Partners' Capital Account [Line Items]
Percentage of cash distributions from operations	85.00%
Percentage of cash distributions from sales or refinancing	85.00%
General Partner
Limited Partners' Capital Account [Line Items]
Allocation of Net Income, Net Losses, and Distributions	7.50%
General Partner | First
Limited Partners' Capital Account [Line Items]
Percentage of cash distributions from operations	7.50%
Percentage of cash distributions from operations as incentive management fee	4.00%
Percentage of cash distributions from sales or refinancing	7.50%
General Partner | Second
Limited Partners' Capital Account [Line Items]
Percentage of cash distributions from operations	7.50%
Percentage of cash distributions from operations as incentive management fee	7.50%
Percentage of cash distributions from sales or refinancing	7.50%
Percentage of cash distributions from sales or refinancing as incentive management fee	7.50%
Initial Limited Partner
Limited Partners' Capital Account [Line Items]
Limited Partners capital account, units issued	50	50