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Organization and Background	3 Months Ended
Organization and Background	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Background	Organization and Background BRT Apartments Corp. (the "Company"), a Maryland corporation, owns, operates and develops multi‑family properties. The Company conducts its operations to qualify as a real estate investment trust, or REIT, for federal income tax purposes. Generally, the multi‑family properties are acquired with joint venture partners in transactions in which the Company contributes a significant portion of the equity. At December 31, 2017, the Company owns: (a) 34 multi-family properties with 9,684 units (including 445 units at two properties engaged in lease-up activities and 402 units at a property under development), located in 11 states with a carrying value of $921,522,000; and (b) interests in three unconsolidated multi-family joint ventures with a carrying value of $21,000,000.