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Interest Rate Contracts - Impact of Interest Rate Swap on Consolidated Statements of Operation (Details) - Interest Rate Swap - Cash Flow Hedging - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | $ 428 | $ 662
Amount of (gain) loss recognized in AOCI on derivatives | $ (281) | $ (190) |  |
Amount of gain (loss) reclassified from AOCI into earnings under “Interest expense” | 922 | 207 |  |
Total interest expense presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded | 14,775 | 11,445 |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  | (319) | 179
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net |  |  | (80) | 155
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | (3,035) | 6,253
Amount of (gain) loss recognized in AOCI on derivatives | (8,458) | (142) |  |
Amount of gain (loss) reclassified from AOCI into earnings under “Interest expense” | 1,182 | (3,330) |  |
Total interest expense presented in the consolidated statement of operations in which the effects of cash flow hedges are recorded | $ 41,251 | $ 37,232 |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  |  | (3,856) | 8,286
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net |  |  | $ (19) | $ (70)

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