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Investments in Unconsolidated Joint Ventures (Narrative) (Details) | 9 Months Ended |
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Sep. 30, 2018 property joint_venture | Dec. 31, 2017 property
Schedule of Equity Method Investments [Line Items] |  |
Number of properties | property | 198 | 205
Properties in Seattle, Hong Kong, Tokyo, Osaka |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in joint ventures | 50.00% |
Number of joint ventures | joint_venture | 4 |
Prudential Real Estate Investors and Griffin Capital Essential Asset REIT, Inc. |  |
Schedule of Equity Method Investments [Line Items] |  |
Number of joint ventures | joint_venture | 2 |
PREI |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in joint ventures | 20.00% |
Number of joint ventures | joint_venture | 1 |
Number of properties | property | 10 |
GCEAR |  |
Schedule of Equity Method Investments [Line Items] |  |
Number of properties | property | 1 |
Property in Silicon Valley |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage in joint ventures | 17.00% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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