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Related Party Transactions - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2016 ft² property | Sep. 30, 2017 USD ($) ft² director | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² director | Sep. 30, 2016 USD ($) | 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 | $ 300 | $ 900 | $ 1,100 |
Affliliated entity | Property management fee revenue |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  | 100 | 100 | 200 | 300 |
Affliliated entity | Leased space rental |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  | $ 70 |  | 200 |
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 |  |  |  | 5,800 | $ 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 |  | $ 300 |  |

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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