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Financing Arrangement - Narrative (Details) ft² in Thousands, $ in Thousands |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2009 ft² | Jun. 30, 2018 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Joint Ventures [Line Items] |  |  |  |
Distributions in excess of co-venture obligation |  | $ 0 |  | $ 31,150
Financing arrangement obligation |  | 389,323 |  | 0
Accumulated deficit |  | $ (1,489,742) |  | $ (830,279)
Discount rate |  | 5.80% |  |
Joint Venture | Chandler Freehold |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Distributions in excess of co-venture obligation |  |  | $ 31,150 |
Financing Arrangement |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Operating income multiple |  | 20.8333333333 |  |
Financing Arrangement | Minimum |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Market rents per square foot |  | 20 |  |
Financing Arrangement | Maximum |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Market rents per square foot |  | 225 |  |
Financing Arrangement | Joint Venture | Chandler Freehold | ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Financing arrangement obligation |  |  | 393,709 |
Accumulated deficit |  |  | $ 424,859 |
Financing Arrangement | Chandler Freehold |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Percentage of loan assumed by third party | 49.90% |  |  |
Financing Arrangement | Chandler Fashion Center |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Property area (in square feet) | ft² | 1,318 |  |  |
Financing Arrangement | Freehold Raceway Mall |  |  |  |
Schedule of Joint Ventures [Line Items] |  |  |  |
Property area (in square feet) | ft² | 1,672 |  |  |

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