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Real Estate - Summary of Purchase Price Allocation (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) ft²	Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($)
Real Estate [Line Items]
Land	$ 122,482	$ 122,482	$ 117,569
In-place lease valuation - above (below) market	(62,070)	(62,070)	(61,069)
Payable- Ground Lease Payments	$ (853,708)	$ (906,059)
Approx. Square Feet | ft²	7,300,000	7,300,000
Investment Building and Building Improvements	$ 819,079	$ 815,721	787,999
Deferred Costs, Leasing, Gross	240,364	240,364	227,407
In-place lease valuation (above market)	4,046	4,046	3,828
Quaker Property [Member]
Real Estate [Line Items]
Receivable- Ground Lease	0
Payable- Ground Lease Payments	0
McKesson Property [Member]
Real Estate [Line Items]
Receivable- Ground Lease	0
Payable- Ground Lease Payments	0
Griffin Capital Essential Asset REIT, Inc. [Member]
Real Estate [Line Items]
Land	352,419	341,432	374,557
Payable- Ground Lease Payments	(1,670,100)	(1,633,495)
Acquisition cost	5,700
Investment Building and Building Improvements	2,172,884	2,022,372	2,102,785
Deferred Costs, Leasing, Gross	532,207	494,871	541,646
In-place lease valuation (above market)	42,736	42,736	47,419
In-place lease valuation (below market)	(55,482)	(49,774)	$ (51,966)
Griffin Capital Essential Asset REIT, Inc. [Member] | Griffin Capital (Highway 94) Investors, DST [Member]
Real Estate [Line Items]
Land		5,886
Building and improvements		108,000
Tenant origination and absorption costs		19,859
Real Estate Investments, Net		134,128
Acquisition cost		4,100
Griffin Capital Essential Asset REIT, Inc. [Member] | HealthSpring [Member]
Real Estate [Line Items]
Purchase Price		130,000
Acquisition cost		$ 3,791
Approx. Square Feet | ft²		451,600
Griffin Capital Essential Asset REIT, Inc. [Member] | Quaker Property [Member]
Real Estate [Line Items]
Purchase Price	59,600
Land	5,433
Building and improvements	50,953
Tenant origination and absorption costs	4,387
In-place lease valuation - above (below) market	(502)
Real Estate Investments, Net	60,271
Acquisition cost	$ 1,777
Approx. Square Feet | ft²	605,400
Griffin Capital Essential Asset REIT, Inc. [Member] | McKesson Property [Member]
Real Estate [Line Items]
Purchase Price	$ 67,000
Land	312
Building and improvements	45,109
Tenant origination and absorption costs	24,652
In-place lease valuation - above (below) market	(933)
Real Estate Investments, Net	69,140
Acquisition cost	$ 2,139
Approx. Square Feet | ft²	271,100
Griffin Capital Essential Asset REIT, Inc. [Member] | Shaw Property [Member]
Real Estate [Line Items]
Purchase Price	$ 56,526
Land	5,465
Building and improvements	48,820
Tenant origination and absorption costs	8,297
In-place lease valuation - above (below) market	(4,273)
Receivable- Ground Lease	2,008
Payable- Ground Lease Payments	(2,008)
Real Estate Investments, Net	58,309
Acquisition cost	$ 1,782
Approx. Square Feet | ft²	1,001,500
Griffin Capital Essential Asset REIT, Inc. [Member] | Leases, Acquired-in-Place, Market Adjustment [Member] | Griffin Capital (Highway 94) Investors, DST [Member]
Real Estate [Line Items]
In-place lease valuation - above (below) market		$ 383
The Allstate Property [Member]
Real Estate [Line Items]
Land		1,808
Real Estate Investments, Net		14,897
Acquisition cost		$ 1,200
Approx. Square Feet | ft²		70,300
Investment Building and Building Improvements		$ 9,071
Deferred Costs, Leasing, Gross		5,019
In-place lease valuation (above market)		0
In-place lease valuation (below market)		(1,001)
MISO Property [Member]
Real Estate [Line Items]
Land		3,104
Real Estate Investments, Net		$ 29,336
Approx. Square Feet | ft²		133,400
Investment Building and Building Improvements		$ 18,077
Deferred Costs, Leasing, Gross		7,937
In-place lease valuation (above market)		218
In-place lease valuation (below market)		$ 0

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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