Investment in Unconsolidated Joint Ventures (Crawford Long—CPI, LLC) (Details) - Crawford Long - CPI, LLC ft² in Thousands, $ in Millions	Dec. 31, 2016 USD ($) ft²
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%
Square footage of real estate property (square feet) \| ft²	358
Outstanding balance of mortgage loan	$ 72.8
Cash balance of joint venture	$ 1.2
Secured Mortgage Note Payable
Schedule of Equity Method Investments [Line Items]
Interest rate on mortgage loan (percent)	3.50%
Emory University
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%

Equity method investments summarized financial information cash.

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Area of a real estate property.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The carrying amount of the outstanding balance due under the mortgage loan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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