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Background and Basis of Presentation (Details) ft² in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 17, 2018 a | Dec. 31, 2020 a ft² property segment | Dec. 31, 2019 USD ($) a | Dec. 31, 2018 USD ($) | Feb. 28, 2019 a
Real Estate [Line Items] |  |  |  |  |
Number of operating segments | segment |  | 3 |  |  |
Gross leasable area (in sq ft) | ft² |  | 3.9 |  |  |
Area of ground leases owned (in acres) | a |  | 153.8 |  |  |
Maui | Mahi Pono Holdings, LLC | Not Discontinued Operations |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Gross profit | $ |  |  | $ 6.7 | $ 162.2 |
Area of land sold (acres) | a | 41,000 |  | 41,000 |  | 800
GPRM Prestress, LLC |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Ownership interest percentage in subsidiaries |  | 51.00% |  |  |
GLP Alphalt, LLC |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Ownership interest percentage in subsidiaries |  | 70.00% |  |  |
Maui Diversified Agriculture | Maui | Not Discontinued Operations |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Ownership interest held (percent) | 100.00% |  |  |  |
Retail |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Company's CRE improved real estate assets |  | 22 |  |  |
Industrial Properties |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Company's CRE improved real estate assets |  | 10 |  |  |
Office |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |
Company's CRE improved real estate assets |  | 4 |  |  |

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