Significant Accounting Policies (Details 8) (USD $)	0 Months Ended	3 Months Ended
	May 28, 2014 property	Mar. 31, 2014	Mar. 31, 2015
Strip Center Business and Small Malls
Discontinued Operations
Number of properties merged under spin off into Washington Prime, an independent publicly traded REIT	98
Amount of retained proceeds from recently completed unsecured debt and mortgage debt as part of the spin-off	$ 1,000,000,000
Summarized financial information for discontinued operations
TOTAL REVENUE		157,969,000
Property operating		26,140,000
Depreciation and amortization		45,968,000
Real estate taxes		19,948,000
Repairs and maintenance		7,150,000
Advertising and promotion		1,952,000
Provision for credit losses		786,000
Other		1,118,000
Total operating expenses		103,062,000
OPERATING INCOME		54,907,000
Interest expense		(13,917,000)
Income and other taxes		(75,000)
Income from unconsolidated entities		345,000
Gain upon acquisition of controlling interests and sale or disposal of assets and interest in unconsolidated entities, net		242,000
CONSOLIDATED NET INCOME		41,502,000
Net income attributable to noncontrolling interests		5,989,000
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS		35,513,000
Additional disclosures
Capital expenditures on a cash basis		24,800,000
Washington Prime Group Inc
Additional disclosures
Transition services fees earned			$ 1,300,000
Washington Prime Group Inc | Strip Center Business and Small Malls
Additional disclosures
Term of property management agreement	2 years
Renewal term of property management agreement	1 year
Termination period of property management agreement	2 years
Period of prior written notice for termination of property management agreement	180 days
Termination period of transition services agreement	2 years
Minimum notice period for transition services agreement	180 days
Minimum notice period as percentage of original service period	50.00%
Exchange ratio of common shares for entity's stockholders to receive under spin off	0.50
Washington Prime Group Inc | Minimum
Additional disclosures
Annual fixed rate property management fees (as a percent)	2.50%
Washington Prime Group Inc | Maximum
Additional disclosures
Annual fixed rate property management fees (as a percent)	4.00%
Washington Prime Group LP | Strip Center Business and Small Malls
Additional disclosures
Exchange ratio of common units for entity's stockholders to receive under spin off	0.50