Noncontrolling Interests on the Company's Consolidated Financial Statements - Additional Information (Details) - SL Green Operating Partnership - shares	Mar. 31, 2026	Dec. 31, 2025
Organization
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)	5,878,318	4,877,891
Operating Partnership
Organization
Noncontrolling interest in the operating partnership (as a percent)	7.63%	6.42%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant