XML 78 R65.htm IDEA: XBRL DOCUMENT
v3.19.2

Equity - Schedule of Share Redemptions (Details) - Common Stock - Share Redemption Program - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |
Stock redeemed during period (in shares) | 0 | 6,700,875 | 0 | 6,701,939
Weighted average price per share (in dollars per share) | $ 0.00 | $ 9.59 | $ 0.00 | $ 9.59

X
- Definition Stock Repurchased During Period, Average Cost per Share + References No definition available. + Details
Name: | gcnl_StockRepurchasedDuringPeriodAverageCostperShare
Namespace Prefix: | gcnl_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRedeemedOrCalledDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=gcnl_ShareRedemptionProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |