Related Party Transactions - Acquisitions and Commitments (Details) $ in Thousands, ft² in Millions			1 Months Ended					12 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2023 USD ($) shares	Apr. 30, 2024 USD ($)	Jan. 31, 2024 USD ($) lease	Sep. 30, 2023 USD ($)	Feb. 28, 2022 USD ($) director shares	Jun. 30, 2021 USD ($) ft²	Dec. 31, 2025 USD ($) director	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Write-off of investment in preferred equity								$ 1,945
Interest income from sales-type leases								286,077	$ 264,250	$ 235,503
Ground Lease acquisition purchase price								135,680
Land and Related Ground Lease
Related Party Transaction [Line Items]
Future funding obligation, amount								51,800
Leasehold improvement allowance, funded amount								51,800
Ground Lease Plus Fund
Related Party Transaction [Line Items]
Number of Ground Leases acquired \| lease				1
Ground Lease acquisition purchase price				$ 38,300
Office space development property
Related Party Transaction [Line Items]
Number of square feet \| ft²							1.1
Purchase price of property under purchase option agreement							$ 215,000
Proceeds from sale of acquisition right under purchase option agreement					$ 300
Office space development property \| Other expense
Related Party Transaction [Line Items]
Loss on sale of acquisition right under purchase option agreement					$ 1,900
Caret Units
Related Party Transaction [Line Items]
Number of former independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest \| director						1
Number of units sold \| shares						108,571
Number of shares to be sold under purchase commitment related to merger \| shares						28,571
Expected proceeds from sale of shares under purchase commitment						$ 5,000
Period in which the entity is obligated to provide a public market listing						2 years
Proceeds from stock transaction						$ 19,000
Caret Units \| MSD Partners
Related Party Transaction [Line Items]
Number of units sold \| shares		100,000
Proceeds from stock transaction		$ 20,000
Existing third-party Caret unit
Related Party Transaction [Line Items]
Number of units sold \| shares		22,500
Proceeds from stock transaction		$ 4,500
Related party \| Ground Lease Plus Fund \| Land and Related Ground Lease
Related Party Transaction [Line Items]
Purchase price per agreement for acquisition of land and related Ground Lease, subject to certain conditions being met								$ 42,000
Multiple required by seller that may trigger payment of additional consideration								1.25
Percentage of required seller return on investment that may trigger payment of additional consideration								9.00%
Related party \| Ground Lease Plus Fund \| Land and Related Ground Lease \| Maximum
Related Party Transaction [Line Items]
Real Estate, Leasehold Improvement Allowance								$ 83,000
iStar Inc. \| Land and Related Ground Lease
Related Party Transaction [Line Items]
Number of former independent directors affiliated with an existing shareholder participating in or related to a particular project or transaction \| director								1
iStar Inc. \| Office space development property
Related Party Transaction [Line Items]
Payment to acquire purchase option agreement							$ 1,200
Preferred equity investment
Related Party Transaction [Line Items]
Funded amount of discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease	$ 1,500
Costs incurred to create entity formed to own leasehold interest in Ground Lease			$ 400
Preferred equity investment \| Maximum
Related Party Transaction [Line Items]
Discretionary commitment to fund preferred equity in entity owning leasehold interest in Ground Lease			$ 9,000
Preferred equity investment \| Other expense
Related Party Transaction [Line Items]
Write-off of investment in preferred equity	$ 1,900
Preferred equity investment \| Land and Related Ground Lease
Related Party Transaction [Line Items]
Interest income from sales-type leases								$ 6,900
Deferred expenses and other assets \| Preferred equity investment
Related Party Transaction [Line Items]
Preferred equity investment									$ 1,900
iStar Inc. \| MSD Partners
Related Party Transaction [Line Items]
Number of units sold \| shares		5,405,406
Safehold, Inc. (Old SAFE) \| Caret Units
Related Party Transaction [Line Items]
Number of former independent directors affiliated with an existing shareholder investing in redeemable noncontrolling interest \| director						1
Number of units sold \| shares						108,571
Percentage of authorized shares sold						1.08%
Number of shares to be sold under purchase commitment related to merger \| shares						28,571
Percentage of authorized shares under commitment to be purchased						0.29%
Expected proceeds from sale of shares under purchase commitment						$ 5,000
Period in which the entity is obligated to provide a public market listing						2 years

Safehold Inc. 10-K