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Related Party Transactions - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2016 ft² property | Jun. 30, 2017 USD ($) ft² director | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) ft² director | Jun. 30, 2016 USD ($) | Jul. 31, 2016 ft² property
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of real estate property (in square feet) | ft² |  | 10,100,000 |  | 10,100,000 |  |
Number of directors | director |  | 1 |  | 1 |  |
Affliliated entity | Supervisory fee revenue |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  | $ 300 | $ 400 | $ 600 | $ 800 |
Affliliated entity | Property management fee revenue |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  | 100 | 100 | 200 | 200 |
Affliliated entity | Leased space rental |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | $ 50 |  | 100 |
Area of real estate property (in square feet) | ft² |  |  |  |  |  | 3,074
Number of properties | property | 1 |  |  |  |  | 1
Lease cancellation, notice period | 90 days |  |  |  |  |
Affliliated entity | Annualized rent revenue |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  |  | 5,700 | $ 5,700 |
Undivided Interest |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of real estate property (in square feet) | ft² | 5,351 |  |  |  |  | 647
Chairman emeritus | Leased space rental |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Percentage of lease space occupied by Chairman emeritus and employee | 15.00% |  |  |  |  |
Revenue from revenue parties, net of payment for pro rata share of leased space |  | $ 100 |  | $ 200 |  |

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