Organization and Business	12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business Steadfast Income REIT, Inc. (the “Company”) was formed on May 4, 2009, as a Maryland corporation that elected to be taxed as, and currently qualifies as, a real estate investment trust (“REIT”). On June 12, 2009, the Company was initially capitalized pursuant to the sale of 22,223 shares of common stock to Steadfast REIT Investments, LLC (the “Sponsor”) at a purchase price of $9.00 per share for an aggregate purchase price of $200,007. On July 10, 2009, Steadfast Income Advisor, LLC (the “Advisor”), a Delaware limited liability company formed on May 1, 2009, invested $1,000 in the Company in exchange for 1,000 shares of convertible stock (the “Convertible Stock”) as described in Note 7 (Stockholders’ Equity). The Company owns a diverse portfolio of real estate investments, primarily in the multifamily sector, located throughout the United States. As of December 31, 2018, the Company owned 35 multifamily properties comprising a total of 9,442 apartment homes, an additional 21,130 square feet of rentable commercial space at two properties and a 10% interest in one unconsolidated joint venture that owned 20 multifamily properties with a total of 4,584 apartment homes. Private Offering On October 13, 2009, the Company commenced a private offering of up to $94,000,000 in shares of the Company’s common stock at a purchase price of $9.40 per share (with discounts available for certain categories of purchasers) (the “Private Offering”). The Company offered its shares of common stock for sale in the Private Offering pursuant to a confidential private placement memorandum and only to persons that were “accredited investors,” as that term is defined under the Securities Act of 1933, as amended (the “Securities Act”), and Regulation D promulgated thereunder. On July 9, 2010, the Company terminated the Private Offering and on July 19, 2010, the Company commenced its registered Public Offering (defined and described below). The Company sold 637,279 shares of common stock in the Private Offering for gross offering proceeds of $5,844,325. Public Offering On July 19, 2010, the Company commenced its initial public offering of up to a maximum of 150,000,000 shares of common stock for sale to the public at an initial price of $10.00 per share (with discounts available for certain categories of purchasers) (the “Primary Offering”). The Company also offered up to 15,789,474 shares of common stock for sale pursuant to the Company’s distribution reinvestment plan (the “DRP,” and together with the Primary Offering, the “Public Offering”) at an initial price of $9.50 per share. The Company terminated its Public Offering on December 20, 2013. Following termination of the Public Offering, the Company continued to offer shares of common stock pursuant to the DRP until the Company’s board of directors suspended the DRP effective with distributions earned beginning on December 1, 2014. Through December 1, 2014, the Company sold 76,095,116 shares of common stock in the Public Offering for gross offering proceeds of $769,573,363, including 4,073,759 shares of common stock issued pursuant to the DRP for gross offering proceeds of $39,580,847. On March 10, 2015, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $10.35 as of December 31, 2014. On February 25, 2016, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $11.44 as of December 31, 2015. On February 15, 2017, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $11.65 as of December 31, 2016. On March 13, 2018, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $10.84 as of December 31, 2017. On May 9, 2018, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $9.84, which represents the estimated value per share of the Company’s common stock of $10.84 as of December 31, 2017, less the special distribution of $1.00 per share of common stock that was paid to stockholders of record as of the close of business on April 20, 2018. On March 13, 2019, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $9.40 as of December 31, 2018. The business of the Company is externally managed by the Advisor, pursuant to the Advisory Agreement by and among the Company, Steadfast Income REIT Operating Partnership, L.P., a Delaware limited partnership formed on July 6, 2009 (the “Operating Partnership”) and the Advisor (as amended, the “Advisory Agreement”), which is subject to annual renewal by the Company’s board of directors. The current term of the Advisory Agreement expires on November 15, 2019. Subject to certain restrictions and limitations, the Advisor manages the Company’s day-to-day operations, manages the Company’s portfolio of properties and real estate-related assets, sources and presents investment opportunities to the Company’s board of directors and provides investment management services on the Company’s behalf. Stira Capital Markets Group, LLC (formerly knows as Steadfast Capital Markets Group, LLC) (the “Dealer Manager”), an affiliate of the Company, served as the dealer manager for the Public Offering. The Advisor, along with the Dealer Manager, also provides marketing, investor relations and other administrative services on the Company’s behalf. Substantially all of the Company’s business is conducted through the Operating Partnership. The Company is the sole general partner of the Operating Partnership. The Company and Advisor entered into an Amended and Restated Limited Partnership Agreement of the Operating Partnership (the “Partnership Agreement”) on September 28, 2009. The Partnership Agreement provides that the Operating Partnership is operated in a manner that will enable the Company to (1) satisfy the requirements for being classified as a REIT for tax purposes, (2) avoid any federal income or excise tax liability and (3) ensure that the Operating Partnership will not be classified as a “publicly traded partnership” for purposes of Section 7704 of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), which classification could result in the Operating Partnership being taxed as a corporation, rather than as a partnership. In addition to the administrative and operating costs and expenses incurred by the Operating Partnership in acquiring and operating real properties, the Operating Partnership will pay all of the Company’s administrative costs and expenses, and such expenses will be treated as expenses of the Operating Partnership.

Organization and Business

Steadfast Income REIT, Inc. (the “Company”) was formed on May 4, 2009, as a Maryland corporation that elected to be taxed as, and currently qualifies as, a real estate investment trust (“REIT”). On June 12, 2009, the Company was initially capitalized pursuant to the sale of 22,223 shares of common stock to Steadfast REIT Investments, LLC (the “Sponsor”) at a purchase price of $9.00 per share for an aggregate purchase price of $200,007. On July 10, 2009, Steadfast Income Advisor, LLC (the “Advisor”), a Delaware limited liability company formed on May 1, 2009, invested $1,000 in the Company in exchange for 1,000 shares of convertible stock (the “Convertible Stock”) as described in Note 7 (Stockholders’ Equity).

The Company owns a diverse portfolio of real estate investments, primarily in the multifamily sector, located throughout the United States. As of December 31, 2018, the Company owned 35 multifamily properties comprising a total of 9,442 apartment homes, an additional 21,130 square feet of rentable commercial space at two properties and a 10% interest in one unconsolidated joint venture that owned 20 multifamily properties with a total of 4,584 apartment homes.

Private Offering

On October 13, 2009, the Company commenced a private offering of up to $94,000,000 in shares of the Company’s common stock at a purchase price of $9.40 per share (with discounts available for certain categories of purchasers) (the “Private Offering”). The Company offered its shares of common stock for sale in the Private Offering pursuant to a confidential private placement memorandum and only to persons that were “accredited investors,” as that term is defined under the Securities Act of 1933, as amended (the “Securities Act”), and Regulation D promulgated thereunder. On July 9, 2010, the Company terminated the Private Offering and on July 19, 2010, the Company commenced its registered Public Offering (defined and described below). The Company sold 637,279 shares of common stock in the Private Offering for gross offering proceeds of $5,844,325.

Public Offering

On July 19, 2010, the Company commenced its initial public offering of up to a maximum of 150,000,000 shares of common stock for sale to the public at an initial price of $10.00 per share (with discounts available for certain categories of purchasers) (the “Primary Offering”). The Company also offered up to 15,789,474 shares of common stock for sale pursuant to the Company’s distribution reinvestment plan (the “DRP,” and together with the Primary Offering, the “Public Offering”) at an initial price of $9.50 per share.

The Company terminated its Public Offering on December 20, 2013. Following termination of the Public Offering, the Company continued to offer shares of common stock pursuant to the DRP until the Company’s board of directors suspended the DRP effective with distributions earned beginning on December 1, 2014. Through December 1, 2014, the Company sold 76,095,116 shares of common stock in the Public Offering for gross offering proceeds of $769,573,363, including 4,073,759 shares of common stock issued pursuant to the DRP for gross offering proceeds of $39,580,847.

On March 10, 2015, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $10.35 as of December 31, 2014. On February 25, 2016, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $11.44 as of December 31, 2015. On February 15, 2017, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $11.65 as of December 31, 2016. On March 13, 2018, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $10.84 as of December 31, 2017. On May 9, 2018, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $9.84, which represents the estimated value per share of the Company’s common stock of $10.84 as of December 31, 2017, less the special distribution of $1.00 per share of common stock that was paid to stockholders of record as of the close of business on April 20, 2018. On March 13, 2019, the Company’s board of directors determined an estimated value per share of the Company’s common stock of $9.40 as of December 31, 2018.

The business of the Company is externally managed by the Advisor, pursuant to the Advisory Agreement by and among the Company, Steadfast Income REIT Operating Partnership, L.P., a Delaware limited partnership formed on July 6, 2009 (the “Operating Partnership”) and the Advisor (as amended, the “Advisory Agreement”), which is subject to annual renewal by the Company’s board of directors. The current term of the Advisory Agreement expires on November 15, 2019. Subject to certain restrictions and limitations, the Advisor manages the Company’s day-to-day operations, manages the Company’s portfolio of properties and real estate-related assets, sources and presents investment opportunities to the Company’s board of directors and provides investment management services on the Company’s behalf. Stira Capital Markets Group, LLC (formerly knows as Steadfast Capital Markets Group, LLC) (the “Dealer Manager”), an affiliate of the Company, served as the dealer manager for the Public Offering. The Advisor, along with the Dealer Manager, also provides marketing, investor relations and other administrative services on the Company’s behalf.

Substantially all of the Company’s business is conducted through the Operating Partnership. The Company is the sole general partner of the Operating Partnership. The Company and Advisor entered into an Amended and Restated Limited Partnership Agreement of the Operating Partnership (the “Partnership Agreement”) on September 28, 2009.

The Partnership Agreement provides that the Operating Partnership is operated in a manner that will enable the Company to (1) satisfy the requirements for being classified as a REIT for tax purposes, (2) avoid any federal income or excise tax liability and (3) ensure that the Operating Partnership will not be classified as a “publicly traded partnership” for purposes of Section 7704 of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”), which classification could result in the Operating Partnership being taxed as a corporation, rather than as a partnership. In addition to the administrative and operating costs and expenses incurred by the Operating Partnership in acquiring and operating real properties, the Operating Partnership will pay all of the Company’s administrative costs and expenses, and such expenses will be treated as expenses of the Operating Partnership.