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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10(c)(3)(ii)(A)) -URI http://asc.fasb.org/extlink&oid=82851474&loc=d3e511914-122862 + Details
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