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Organization and Description of Business	6 Months Ended
Organization and Description of Business	Jun. 30, 2017
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 and operation of single-tenant, 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 substantially all of its assets 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 June 30, 2017 and December 31, 2016, the Company owned a 95.7% and 95.7%, respectively, common equity interest 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 and partnerships, including the Operating Partnership, except where context otherwise requires. As of June 30, 2017, the Company owned 342 buildings in 37 states with approximately 67.7 million rentable square feet, consisting of 274 warehouse/distribution buildings, 53 light manufacturing buildings, 14 flex/office buildings, and one building in redevelopment. The Company’s buildings were approximately 94.0% leased to 296 tenants as of June 30, 2017.