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Business and Organization	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	Business and Organization Business—iStar Inc. (the "Company") finances, invests in and develops real estate and real estate related projects as part of its fully-integrated investment platform. The Company also provides management services for its ground lease equity method investment and net lease joint ventures (refer to Note 7). The Company has invested approximately $40 billion of capital over the past two decades and is structured as a real estate investment trust ("REIT") with a diversified portfolio focused on larger assets located in major metropolitan markets. The Company's primary reportable business segments are real estate finance, net lease, operating properties and land and development (refer to Note 17). Organization—The Company began its business in 1993 through the management of private investment funds and became publicly traded in 1998. Since that time, the Company has grown through the origination of new investments and corporate acquisitions.

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