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Fair Value Measurements - Financial Instruments at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 490,055	$ 484,728	$ 460,428
Notes Payable, Other Payables [Member] | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value		126,970	126,970
Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	376,970	126,970
Mortgages | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	126,970	126,970
Fair Value | Notes Payable, Other Payables [Member] | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		122,928	120,322
Fair Value | Mortgages | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	119,338	122,928
Reported Value Measurement [Member] | Notes Payable, Other Payables [Member] | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		126,970	126,970
Reported Value Measurement [Member] | Mortgages | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	126,970
Griffin Capital Essential Asset REIT, Inc. [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	1,363,776	1,397,779	1,458,343
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	648,776	672,626	345,934
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	107,998	109,275	110,640
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Highway 94 loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	16,714	17,352	18,175
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | BofA loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	375,000	375,000	0
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | BofA loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	22,309	22,961	23,786
Griffin Capital Essential Asset REIT, Inc. [Member] | Fair Value | Mortgages | AIG Loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		113,715	113,052
Griffin Capital Essential Asset REIT, Inc. [Member] | Fair Value | Mortgages | Highway 94 loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	15,637	16,484	17,073
Griffin Capital Essential Asset REIT, Inc. [Member] | Fair Value | Mortgages | BofA loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 361,602	377,289
Griffin Capital Essential Asset REIT, Inc. [Member] | Fair Value | Mortgages | BofA loan | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		23,851	24,349
Griffin Capital Essential Asset REIT, Inc. [Member] | Reported Value Measurement [Member] | Mortgages | AIG Loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		109,275	110,640
Griffin Capital Essential Asset REIT, Inc. [Member] | Reported Value Measurement [Member] | Mortgages | Highway 94 loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		17,352	18,175
Griffin Capital Essential Asset REIT, Inc. [Member] | Reported Value Measurement [Member] | Mortgages | BofA loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		$ 22,961	$ 23,786

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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+ References

No definition available.

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