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Acquisitions - Narrative (Details) (USD $) | 9 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 4 Months Ended |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Jul. 22, 2011 Fashion Outlets of Niagara sqft | Sep. 30, 2014 Fashion Outlets of Niagara | Jan. 31, 2013 Green Acres Mall | Jan. 24, 2013 Green Acres Mall sqft | Dec. 31, 2012 Green Acres Mall | Apr. 25, 2013 Green Acres Adjacent acre | Oct. 24, 2013 Superstition Springs Land I | Oct. 24, 2013 Superstition Springs Land I sqft | Jun. 04, 2014 Cascade Mall | Sep. 30, 2014 Cascade Mall | Jun. 04, 2014 Cascade Mall sqft | Jun. 03, 2014 Cascade Mall | Oct. 24, 2013 Cascade Mall | Sep. 17, 2013 Camelback Colonnade sqft | Sep. 16, 2013 Camelback Colonnade
Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) |  |  | 517,000 |  |  | 1,791,000 |  | 19 |  | 1,082,000 |  |  | 593,000 |  |  | 619,000 |
Contingent consideration |  |  |  | $ 18,667,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | 200,000,000 |  |  | 500,000,000 |  | 22,577,000 | 46,162,000 |  |  |  |  |  |  |  |
Deposits paid |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |
Purchase price, balance remaining after deposit |  |  |  |  |  | 470,000,000 |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | 325,000,000 |  |  |  |  |  |  |  |  |  |  |
Amount of additional borrowing |  |  |  |  | 225,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73.20%
Additional ownership interest acquired (as a percent) |  |  |  |  |  |  |  |  |  | 33.30% |  |  | 49.00% |  |  | 67.50% |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  | 23,662,000 |  | 15,233,000 |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company | 0 | 109,858,000 |  |  |  |  |  |  | 22,500,000 |  |  |  |  |  |  |  |
Ownership interest at completion of acquisition (as a percent) |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  | 100.00% | 100.00% |  | 100.00%
Incremental revenue |  |  |  |  |  |  |  |  |  |  |  | 2,337,000 |  |  |  |  |
Incremental earnings |  |  |  |  |  |  |  |  |  |  |  | $ 667,000 |  |  |  |  |

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- Definition Represents the cash outflow for deposits on the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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