Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Class A Units	Jun. 30, 2013 Class B Units	Jun. 30, 2013 General Partners	Jun. 30, 2013 First Priority Class A Units	Jun. 30, 2013 Second Priority General Partners	Jun. 30, 2013 Third Priority Class A Units	Jun. 30, 2013 Third Priority General Partners	Jun. 30, 2013 Third Priority Limited Partners	Jun. 30, 2013 Fourth Priority Limited Partners	Jun. 30, 2013 Fifth Priority Class A Units	Jun. 30, 2013 Fifth Priority Class B Units	Jun. 30, 2013 Sixth Priority General Partners	Jun. 30, 2013 Seventh Priority General Partners	Jun. 30, 2013 Seventh Priority Limited Partners
Limited Partnership Distributions [Line Items]
Impairment of real estate	$ 0
Distribution of Net Cash from Operations
Distribution of net cash from operations based on capital contributions (percent)					10.00%
Distribution of net cash from operations based on cumulative distributions (percent)						10.00%
Distribution of net cash from operations based on allocation (percent)							90.00%	10.00%
Distribution of Net Sale Proceeds
Distribution of net sale proceeds based on partner capital contributions (percent)									100.00%				100.00%
Distribution of net sale proceeds based on partners' return on capital contributions (percent)										10.00%
Distribution of net sale proceeds based on preferential limited partner return (percent)											10.00%	15.00%
Distribution of net sale proceeds based additional excess (percent)													25.00%
Distribution of net sale proceeds based on allocation (percent)														20.00%	80.00%
Allocations of Net Income, Net Loss, and Gain on Sale
Distribution of excess net income based on allocation (percent)		99.00%		1.00%
Distribution of net loss, depreciation, and amortization based on allocation (percent)			99.00%	1.00%

WELLS REAL ESTATE FUND IX LP 10-Q