XML 63 R48.htm IDEA: XBRL DOCUMENT
v3.21.2

Equity and Mezzanine Equity - Dividends Paid (Detail) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Senior Common Stock |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Common Stock, dividends paid per share | $ 0.2625 | $ 0.2625 | $ 0.5250 | $ 0.5250
Series D Preferred Stock |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred Stock, dividends paid per share | 0.4374999 | 0.4374999 | 0.8749998 | 0.8749998
Series E Preferred Stock |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred Stock, dividends paid per share | 0.414063 | 0.414063 | 0.828126 | 0.828126
Series F Preferred Stock |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Preferred Stock, dividends paid per share | 0.375 | 0.375 | 0.750 | 0.375
Common Stock |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Common Stock, dividends paid per share | $ 0.37545 | $ 0.37545 | $ 0.75090 | $ 0.75090

X
- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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_DividendsPayableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate dividends paid during the period for each share of preferred stock outstanding. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendsPerShareCashPaid
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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