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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

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