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Debt - Narrative (Details) |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2018 USD ($) | Apr. 27, 2018 USD ($) entity property | Mar. 31, 2018 | Sep. 29, 2017 USD ($) | Oct. 22, 2015 USD ($) entity | Jul. 20, 2015 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) property | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 22, 2016 USD ($) | Mar. 29, 2016 USD ($) | Aug. 11, 2015 USD ($) | Dec. 12, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  | 3.81% |  | 3.13% |  |  |  |  |  |
Number of Wholly Owned Special Purpose Entities | entity |  | 4 |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties Owned by Special Purpose Entity | property |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 481,573,000 |  | $ 481,848,000 | $ 456,472,000 |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  |  |  |  |  | 357,673,000 | $ 0 | 0 | 55,000,000 | $ 147,492,000 |  |  |  |
Proceeds from Lines of Credit |  |  |  |  |  |  |  |  | 0 | 14,300,000 | 24,300,000 | 249,900,000 | 286,050,000 |  |  |  |
Total principal |  |  |  |  |  |  |  |  | 490,055,000 |  | 484,728,000 | 460,428,000 |  |  |  |  |
Revolving Credit Facility | Key Bank Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  | $ 410,000,000.0 | $ 250,000,000.0
Initial debt instrument term | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250,000,000.00
Line Of Credit Facility, Extension Term | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  | $ 214,700,000 |  | $ 143,100,000 |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Number of Pool Properties | property |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Aggregate Pool Value Contributed by Single Pool Property |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Aggregate Pool Value to be Contributed byPool Properties Subject to ground Leases |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Aggregate Pool Value to be Contributed by Pool Properties Under Development |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Leasing Percentage of All Pool Properties |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Asset Pool Leverage Ratio |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Asset Pool Debt Service Coverage Ratio |  |  |  |  |  |  |  |  | 135.00% |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  | $ 249,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Wholly Owned Special Purpose Entities Released From Obligation | entity |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Key Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial debt instrument term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan [Member] | BofA / Key Bank Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial debt instrument term |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual stated interest rate (percent) |  | 4.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for written notice |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable, Other Payables [Member] | AIG Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 4.22% |  |  |  |  |  |
Initial debt instrument term |  |  |  |  | 10 years |  |  |  |  |  | 10 years |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  |  | 4.15% |  |  |  |  |  | 4.15% |  |  |  |  |  |
Period for written notice |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 127,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Payment Terms, Duration Requiring Monthly Payments of Interest Only |  |  |  |  | 5 years |  |  |  |  |  | 5 years |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  |  |  | $ 126,970,000 | $ 126,970,000 |  |  |  |  |
Line of Credit | Key Bank Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  |  |  | 2.92% |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 3.65% |  | 3.32% |  |  |  |  |  |
Initial debt instrument term |  |  |  |  |  |  |  |  | 4 years |  | 4 years | 4 years |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 2.87% |  |  |  |  |  |
Line Of Credit Facility, Extension Term |  |  |  |  |  |  |  |  | 1 year |  | 1 year | 1 year |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 85,000 |  | $ 357,758,000 | $ 333,458,000 |  |  |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 376,970,000 |  | 126,970,000 |  |  |  |  |  |
Mortgages | BofA / Key Bank Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 4.36% |  |  |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  |  |  | 4.32% |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 250,000,000 |  | 0 |  |  |  |  |  |
Mortgages | AIG Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 4.22% |  |  |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  |  |  | 4.15% |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 126,970,000 |  | $ 126,970,000 |  |  |  |  |  |
LIBOR | Line of Credit | Key Bank Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.50% |  |  |  |  |  | 1.30% |  | 1.50% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  | $ 1,150,000,000 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | 1,354,350,000 |  | $ 1,386,084,000 | 1,447,535,000 |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  |  |  |  |  | 106,253,000 | 294,054,000 | 41,493,000 | 35,954,000 | 31,407,000 |  |  |  |
Proceeds from Lines of Credit |  |  |  |  |  |  |  |  | 96,100,000 | $ 44,000,000 | 54,000,000 | 55,100,000 | 481,653,000 |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 1,363,776,000 |  | 1,397,779,000 | 1,458,343,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Plainfield Mortgage Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 18,700,000 |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolver Loan, July 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  |  |  |  |  |  |  | 344,100,000 |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Line of Credit | Unsecured Credit Facility (July 2015) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 1,140,000,000.00 |  |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 | $ 173,000,000 |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Unsecured Credit Facility (July 2015) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 3.89% |  | 3.19% |  |  |  |  |  |
Initial debt instrument term |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Debt instrument extended term |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum increment to borrowing capacity available under accordion feature |  |  |  |  |  | 860,000,000 |  |  |  |  |  |  |  |  |  |  |
Minimum increments allowed under accordion feature |  |  |  |  |  | 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity available under accordion feature |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 715,000,000 |  | $ 715,000,000 | 715,000,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Revolver Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 3.77% |  | 3.79% |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 0 |  | $ 10,153,000 | 397,409,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Fixed and Variable Rate Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  | 3.70% |  | 3.53% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 648,776,000 |  | $ 672,626,000 | 345,934,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | TW Telecom Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 0.00% |  | 4.04% |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 0 |  | $ 19,169,000 | 20,353,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Bank of America loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 3.91% |  | 3.90% |  |  |  |  |  |
Initial debt instrument term |  |  |  | 10 years |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Amount borrowed |  |  |  | $ 375,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  | 3.77% |  |  |  |  | 3.77% |  | 3.77% |  |  |  |  |  |
Debt Instrument, Prepayment Condition, Prior Notice Required |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 375,000,000 |  | $ 375,000,000 | 0 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | AIG Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 5.07% |  | 5.07% |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  |  |  | 4.96% |  | 4.96% |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  | $ 107,998,000 |  | $ 109,275,000 | 110,640,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Plainfield Mortgage Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Total principal |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 18,932,000 |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  |  |  |  |  | $ 21,000,000.0 | $ 23,000,000.0 |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Unsecured Debt | Unsecured Credit Facility (July 2015) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial debt instrument term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  | $ 640,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 344,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Unsecured Debt | Increase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 715,000,000.0 |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Fixed Rate Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  | 3.75% |  | 3.54% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (percent) |  |  |  |  |  |  |  |  | 2.11% |  | 1.56% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR | Revolving Credit Facility | Unsecured Credit Facility (July 2015) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  | 1.40% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR | Revolving Credit Facility | Revolver Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  | 1.45% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR | Mortgages | TW Telecom Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  | 2.45% |  |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  | $ 425,000,000 |  | $ 725,000,000.0 |  |  |  |  |  |

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- Definition Debt Instrument, Covenant, Asset Pool Leverage Ratio + References No definition available. + Details
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Namespace Prefix: | gcnl_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Debt Instrument, Covenant, Maximum Aggregate Pool Value To Be Contributed by Single Pool Property + References No definition available. + Details
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