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Debt - Schedule of Debt (Details) - USD ($) |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2018 | Mar. 31, 2018 | Sep. 29, 2017 | Oct. 22, 2015 | Jul. 20, 2015 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 01, 2016 | Feb. 25, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 3.81% | 3.13% |  |  |
Total principal |  |  |  |  |  | $ 490,055,000 | $ 484,728,000 | $ 460,428,000 |  |
Debt Issuance Costs, Net |  |  |  |  |  | (8,482,000) | (2,880,000) | (3,956,000) |  |
Debt, net |  |  |  |  |  | $ 481,573,000 | $ 481,848,000 | 456,472,000 |  |
LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate |  |  |  |  |  | 2.11% |  |  |  |
Debt Instrument, Basis Rate |  |  |  |  |  |  | 1.57% |  |  |
Revolving Credit Facility | Key Bank Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term | 4 years |  |  |  |  |  |  |  |  |
Line Of Credit Facility, Extension Term | 1 year |  |  |  |  |  |  |  |  |
Line of Credit | Key Bank Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  | 2.92% |  |  |
Total principal |  |  |  |  |  | $ 85,000 | $ 357,758,000 | $ 333,458,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  | 2.87% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 3.65% | 3.32% |  |  |
Debt Instrument, Term |  |  |  |  |  | 4 years | 4 years | 4 years |  |
Line Of Credit Facility, Extension Term |  |  |  |  |  | 1 year | 1 year | 1 year |  |
Line of Credit | Key Bank Credit Facility [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term to Determine Weighted Average Interest Rate |  |  |  |  |  |  | 365 days |  |  |
Debt Instrument, Term to Determine Contractual Interest Rate |  |  |  |  |  |  | 360 days |  |  |
Spread over variable rate (percent) |  | 1.50% |  |  |  | 1.30% | 1.50% |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 376,970,000 | $ 126,970,000 |  |  |
Mortgages | BofA / Key Bank Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 250,000,000 | 0 |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 4.32% |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 4.36% |  |  |  |
Mortgages | AIG Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 126,970,000 | 126,970,000 |  |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 4.15% |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 4.22% |  |  |  |
Notes Payable, Other Payables [Member] | AIG Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  | $ 126,970,000 | $ 126,970,000 |  |
Debt, net |  |  |  | $ 127,000,000 |  |  |  |  |  |
Contractual stated interest rate (percent) |  |  |  | 4.15% |  |  | 4.15% |  |  |
Effective interest rate (percent) |  |  |  |  |  |  | 4.22% |  |  |
Debt Instrument, Term |  |  |  | 10 years |  |  | 10 years |  |  |
Debt Instrument, Payment Terms, Duration Requiring Monthly Payments of Interest Only |  |  |  | 5 years |  |  | 5 years |  |  |
Notes Payable, Other Payables [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 113,000,000 | $ 0 |  |  |
Effective interest rate (percent) |  |  |  |  |  | 3.58% |  |  |  |
Notes Payable, Other Payables [Member] | Term Loan [Member] | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Spread over variable rate (percent) |  |  |  |  |  | 1.25% |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 1,150,000,000 |  |  |  |
Total principal |  |  |  |  |  | 1,363,776,000 | 1,397,779,000 | 1,458,343,000 |  |
Unamortized Deferred Financing Costs and Discounts, net |  |  |  |  |  | (9,426,000) | (11,695,000) | (10,808,000) |  |
Debt Issuance Costs, Net |  |  |  |  |  |  | (11,414,000) |  |  |
Debt, net |  |  |  |  |  | $ 1,354,350,000 | $ 1,386,084,000 | 1,447,535,000 |  |
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] | Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 715,000,000 | $ 715,000,000 | 715,000,000 |  |
Effective interest rate (percent) |  |  |  |  |  | 3.89% | 3.19% |  |  |
Debt Instrument, Term |  |  |  |  | 4 years |  |  |  |  |
Debt instrument extended term |  |  |  |  | 1 year |  |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Spread over variable rate (percent) |  |  |  |  |  |  | 1.40% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Revolver Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 0 | $ 10,153,000 | 397,409,000 |  |
Effective interest rate (percent) |  |  |  |  |  | 3.77% | 3.79% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Revolver Loan | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Spread over variable rate (percent) |  |  |  |  |  |  | 1.45% |  |  |
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 | Plainfield Mortgage Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  | $ 0 | 18,932,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  | 0.00% |  |  |
Effective interest rate (percent) |  |  |  |  |  |  | 0.00% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | TW Telecom Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 0 | $ 19,169,000 | 20,353,000 |  |
Effective interest rate (percent) |  |  |  |  |  | 0.00% | 4.04% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | TW Telecom Loan | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Spread over variable rate (percent) |  |  |  |  |  |  | 2.45% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Bank of America loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 21,340,000 | $ 21,694,000 | 22,149,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 4.18% | 4.175% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 4.60% | 4.59% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Midland Mortgage Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 102,753,000 | $ 104,197,000 | 105,600,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 3.94% | 3.94% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 4.12% | 4.08% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Emporia Partners loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 2,662,000 | $ 2,978,000 | 3,377,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 5.88% | 5.88% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 5.96% | 5.96% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | BofA loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 22,309,000 | $ 22,961,000 | 23,786,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 6.08% | 6.08% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 5.16% | 5.22% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Highway 94 loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 16,714,000 | $ 17,352,000 | 18,175,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 3.75% | 3.75% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 4.65% | 4.63% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Bank of America loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 375,000,000 | $ 375,000,000 | 0 |  |
Contractual stated interest rate (percent) |  |  | 3.77% |  |  | 3.77% | 3.77% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 3.91% | 3.90% |  |  |
Debt Instrument, Term |  |  | 10 years |  |  | 10 years |  |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | AIG Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  | $ 107,998,000 | $ 109,275,000 | 110,640,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  | 4.96% | 4.96% |  |  |
Effective interest rate (percent) |  |  |  |  |  | 5.07% | 5.07% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Ace Hardware Mortgage Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Total principal |  |  |  |  |  |  | $ 0 | $ 22,922,000 |  |
Contractual stated interest rate (percent) |  |  |  |  |  |  | 0.00% |  |  |
Spread over variable rate (percent) |  |  |  |  |  |  |  | 5.00% |  |
Effective interest rate (percent) |  |  |  |  |  |  | 0.00% |  |  |
Griffin Capital Essential Asset REIT, Inc. [Member] | Fixed Rate Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 3.75% | 3.54% |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 100,000,000 | $ 200,000,000.0 |  | $ 100,000,000 | $ 100,000,000.0
Interest Rate Swap | Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  | $ 425,000,000 | $ 725,000,000.0 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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