XML 80 R26.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Accounting Policies [Line Items] |
Property, Plant and Equipment [Table Text Block] | The Company anticipates the estimated useful lives of its assets by class to be generally as follows:
Buildings |  | 40 years
Building Improvements |  | 5-20 years
Land Improvements |  | 15-25 years
Tenant Improvements |  | Shorter of estimated useful life or remaining contractual lease term
Tenant Origination and Absorption Cost |  | Remaining contractual lease term
In-place Lease Valuation |  | Remaining contractual lease term with consideration as to below-market extension options for below-market leases
Griffin Capital Essential Asset REIT, Inc. [Member] |
Accounting Policies [Line Items] |
Property, Plant and Equipment [Table Text Block] | The Company anticipates the estimated useful lives of its assets by class to be generally as follows:
Buildings | 25-40 years
Building Improvements | 5-20 years
Land Improvements | 15-25 years
Tenant Improvements | Shorter of estimated useful life or remaining contractual lease term
Tenant Origination and Absorption Cost | Remaining contractual lease term
In-place Lease Valuation | Remaining contractual lease term with consideration as to below-market extension options for below-market leases

X
- Definition [Line Items] for Accounting Policies [Table] + References No definition available. + Details
Name: | gcnl_AccountingPoliciesLineItems
Namespace Prefix: | gcnl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_PropertyPlantAndEquipmentTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=gcnl_GriffinCapitalEssentialAssetREITInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |