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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Mar. 28, 2016 USD ($) | Mar. 01, 2016 USD ($) ft² | Jan. 14, 2016 USD ($) ft² | Jan. 06, 2016 USD ($) ft² | Oct. 30, 2015 USD ($) ft² | Apr. 30, 2015 USD ($) store | Feb. 17, 2015 USD ($) ft² | Nov. 20, 2014 USD ($) ft² | Nov. 14, 2014 USD ($) ft² mall | Aug. 28, 2014 USD ($) ft² | Jul. 30, 2014 USD ($) ft² | Jun. 04, 2014 USD ($) ft² | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Nov. 13, 2014 USD ($) ft²
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (375) | $ 9,850 | $ 3,643 |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,414,659 |
Wilshire Boulevard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  | $ 9,033 |  |  |  |  |  |  |  |
Proceeds from sale |  |  |  |  |  |  |  |  |  | 17,100 |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  |  |  |  | 15,386 |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  |  |  |  | $ 1,714 |  |  |  |  |  |  |  |
PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  | 40.00% |  |  |
Proceeds from sale |  |  |  |  | $ 1,258,643 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  | 713,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  |  |  | $ 545,643 |  |  |  |  |  |  |  |  |  |  |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  | 1,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 101,629 |  |  |
Proceeds from sale |  |  |  | $ 289,496 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  |  | 129,496 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  |  | $ 160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  | $ 340,734 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale |  |  | 771,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment |  |  | 478,608 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of debt |  |  | $ 292,870 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fashion Outlets of Philadelphia | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  | 1,376 |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  |  |  | $ 106,800 |  |  |  |  |  |  |
Joint venture ownership percentage purchased |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Candlestick Point | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500
Candlestick Point | Joint venture | Notes receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,130
Candlestick Point | Joint venture | Notes receivable | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Lakewood Center | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 2,064 |  |  |  |  |  |  |  |  |  |  |  |  |
Los Cerritos Center | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 1,298 |  |  |  |  |  |  |  |  |  |  |  |  |
Queens Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.49% |  |  |
Washington Square | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 1,440 |  |  |  |  |  |  |  |  |  |  |  |  |
South Plains Mall | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  | 1,127 |  |  |  |  |  |  |  |  |  |  |  |  |
Deptford Mall | Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  | 1,039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FlatIron Crossing | Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  | 1,431 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Twenty Ninth Street | Joint venture | MAC Heitman Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  | 847 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PPR Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage purchased |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |
Cascade Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage purchased |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  |  |  |  | 589 |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 15,233 |  |  |  |  |  |
PPR Queens Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage purchased |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  |  | $ 1,838,886 |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  |  |  | $ 672,109 |  |  |  |  |  |  |  |  |
Number of shopping centers | mall |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |
Equity issued (in shares) |  |  |  |  |  |  |  |  | $ 1,166,777 |  |  |  |  |  |  |  |  |
PPR Queens Portfolio | PPR Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 311,194 |  |  |  |
PPR Queens Portfolio | Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 101,629 |  |  |  |  |
PPR Queens Portfolio | Lakewood Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  | 2,064 |  |  |  |  |  |  |  |  |
PPR Queens Portfolio | Los Cerritos Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  | 1,298 |  |  |  |  |  |  |  |  |
PPR Queens Portfolio | Queens Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  | 963 |  |  |  |  |  |  |  |  |
PPR Queens Portfolio | Stonewood Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  | 932 |  |  |  |  |  |  |  |  |
PPR Queens Portfolio | Washington Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  |  | 1,440 |  |  |  |  |  |  |  |  |
443 Wabash MAB LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  |  | 65 |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  |  | $ 18,900 |  |  |  |  |  |  |  |  |  |
Joint venture ownership percentage purchased |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |
Inland Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage purchased |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  |  |  |  |  |  | 866 |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  |  | $ 51,250 |  |  |  |  |  |  |  |  |  |  |
Purchase price funded by cash payment on acquisition |  |  |  |  |  |  | 26,250 |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |
Loan paid off |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |
Sears |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |
Joint venture ownership percentage purchased |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of stores | store |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |
Country Club Plaza | Joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property square footage | ft² |  | 1,246 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price on acquisition |  | $ 660,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price paid through assumption of debt by the Company | $ 320,000 | $ 330,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture ownership percentage |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) | 3.88% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + 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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- Definition For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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