Partners' Equity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012
Partners Capital And Distributions [Line Items]
Percentage of net income attributable General Partner	1.00%
Percentage of net income attributable limited partners	99.00%
Percentage of net loss attributable general partner	24.00%
Percentage of net loss attributable limited partners	76.00%
Additional losses allocated to general partner percentage	1.00%
Additional losses allocated to limited partners percentage	99.00%
Percentage of gain on sale and refinancing allocated to general partner	1.00%
Percentage of gain on sale and refinancing allocated to limited partners	99.00%
Percentage of additional gain on sale and refinancing allocated to general partner	24.00%
Percentage of additional gain on sale and refinancing allocated to limited partners	76.00%