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Related Party Transactions - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) ft² property director | Mar. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |
Area of real estate property (in square feet) | ft² | 10,100,000 |
Number of directors | director | 1 |
Affliliated entity | Supervisory fee revenue |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 0.3 | $ 0.3
Affliliated entity | Property management fee revenue |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | 0.1 | 0.1
Affliliated entity | Leased space rental |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 0.1 | $ 0.1
Number of properties | property | 1 |
Lease cancellation, notice period | 90 days |
Affliliated entity | Annualized rent revenue |  |
Related Party Transaction [Line Items] |  |
Revenue from related parties | $ 4.0 |
Undivided Interest |  |
Related Party Transaction [Line Items] |  |
Area of real estate property (in square feet) | ft² | 5,351 |
Chairman emeritus | Leased space rental |  |
Related Party Transaction [Line Items] |  |
Percentage of lease space occupied by Chairman emeritus and employee | 15.00% |

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- Definition Number of Directors, General Partner in Investment Fund Owning More Than 10% Economic and Voting Interest in Tenant + References No definition available. + Details
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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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