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Real Estate Real Estate - Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract] |  |
Below Market Lease, Amortization Income, Next Twelve Months |  | $ (4,695)
Below Market Lease, Amortization Income, Remainder of Fiscal Year | $ (1,170) |
Below Market Lease, Amortization Income, Year Two | (4,695) | (4,695)
Below Market Lease, Amortization Income, Year Three | (4,695) | (4,695)
Below Market Lease, Amortization Income, Year Four | (3,799) | (3,799)
Below Market Lease, Amortization Income, Year Five | (3,799) | (3,799)
Tenant origination and absorption costs |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 24,198
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year | 6,033 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 24,198 | 24,198
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 24,198 | 24,198
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 19,715 | 19,715
Finite-Lived Intangible Assets, Amortization Expense, Year Five | $ 19,597 | 19,597
Griffin Capital Essential Asset REIT, Inc. [Member] |  |
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract] |  |
Below Market Lease, Amortization Income, Next Twelve Months |  | (1,018)
Below Market Lease, Amortization Income, Year Two |  | (1,856)
Below Market Lease, Amortization Income, Year Three |  | (770)
Below Market Lease, Amortization Income, Year Four |  | (630)
Below Market Lease, Amortization Income, Year Five |  | (1,007)
Griffin Capital Essential Asset REIT, Inc. [Member] | Tenant origination and absorption costs |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 51,363
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 42,721
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 33,302
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 28,724
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 24,918
Griffin Capital Essential Asset REIT, Inc. [Member] | Ground leasehold improvements |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 27
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 27
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 27
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 27
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | 27
Griffin Capital Essential Asset REIT, Inc. [Member] | Other leasing costs |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  | 1,768
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  | 1,782
Finite-Lived Intangible Assets, Amortization Expense, Year Three |  | 1,757
Finite-Lived Intangible Assets, Amortization Expense, Year Four |  | 1,704
Finite-Lived Intangible Assets, Amortization Expense, Year Five |  | $ 1,674

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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization income for leases with a finite life acquired as part of a real property acquisition at below market lease rate expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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