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Organization and Description of Business	9 Months Ended
Organization and Description of Business	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business STAG Industrial, Inc. (the “Company”) is an industrial real estate operating company focused on the acquisition, development, and operation of industrial properties throughout the United States. The Company was formed as a Maryland corporation and has elected to be treated and intends to continue to qualify as a real estate investment trust (“REIT”) under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). The Company is structured as an umbrella partnership REIT, commonly called an UPREIT, and owns all of its properties and conducts substantially all of its business through its operating partnership, STAG Industrial Operating Partnership, L.P., a Delaware limited partnership (the “Operating Partnership”). As of September 30, 2025 and December 31, 2024, the Company owned 98.0% and 98.0%, respectively, of the common units of the limited partnership interests in the Operating Partnership. The Company, through its wholly owned subsidiary, is the sole general partner of the Operating Partnership. As used herein, the “Company” refers to STAG Industrial, Inc. and its consolidated subsidiaries, including the Operating Partnership, except where context otherwise requires. As of September 30, 2025, the Company owned 601 industrial buildings in 41 states with approximately 119.2 million rentable square feet.