Related Party Transactions - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) ft² property director	Mar. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Area of real estate property (in square feet) \| ft²	10,100,000
Number of directors \| director	1
Affiliated entities \| Supervisory fee revenue
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.2	$ 0.3
Affiliated entities \| Property management fee revenue
Related Party Transaction [Line Items]
Revenue from related parties	0.1	0.1
Affiliated entities \| Leased space rental
Related Party Transaction [Line Items]
Revenue from related parties	$ 0.1	$ 0.1
Number of properties \| property	1
Notice period for lease cancellation	90 days
Affiliated entities \| Annualized rent revenue
Related Party Transaction [Line Items]
Revenue from related parties	$ 4.6
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 (as a percent)	15.00%

Lease Cancellation, Period of Notice

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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

Related Party Transaction, Percentage of Leased Space Occupied

+ References

No definition available.

+ Details

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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