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Earnings Per Share (Earnings Allocable to Common Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Denominator for basic and diluted earnings per share:
Weighted average number of shares, Basic (in shares)										73,453	84,987	85,031
Weighted average common shares outstanding for diluted earnings per common share (in shares)										98,467	84,987	85,031
Basic earnings per common share:
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share)										$ 0.60	$ (0.62)	$ (0.40)
Earnings per share, basic (in dollars per share)										0.60	(0.62)	(0.40)
Diluted earnings per common share:
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share)										0.55	(0.62)	(0.40)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share)										$ 0.55	$ (0.62)	$ (0.40)
Denominator for basic and diluted earnings per HPU share:
Weighted average HPUs outstanding for basic and diluted earnings per share (in shares)	[1]									0	9	15
Basic and diluted earnings per HPU share:
Net income (loss) attributable to iStar Inc. and allocable to HPU holders (in dollars per share)	[1]									$ 0.00	$ (120.00)	$ (75.27)
Common Stock
Denominator for basic and diluted earnings per share:
Weighted average number of shares, Basic (in shares)		71,603	71,210	73,984	77,060	83,162	85,766	85,541	85,497	73,453	84,987	85,031
Add: Effect of assumed shares issued under treasury stock method or restricted stock units (in shares)										84	0	0
Weighted average common shares outstanding for diluted earnings per common share (in shares)		71,603	115,666	118,510	77,060	83,581	85,766	85,541	85,497	98,467	84,987	85,031
Basic earnings per common share:
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share)										$ 0.60	$ (0.62)	$ (0.40)
Earnings per share, basic (in dollars per share)		$ (0.27)	$ 0.65	$ 0.52	$ (0.27)	$ 0.09	$ (0.07)	$ (0.36)	$ (0.26)	0.60	(0.62)	(0.40)
Diluted earnings per common share:
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share)										0.55	(0.62)	(0.40)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share)		$ (0.27)	$ 0.44	$ 0.37	$ (0.27)	$ 0.09	$ (0.07)	$ (0.36)	$ (0.26)	0.55	(0.62)	(0.40)
HPU's
Denominator for basic and diluted earnings per HPU share:
Weighted average HPUs outstanding for basic and diluted earnings per share (in shares)						0	7	15	15
Basic and diluted earnings per HPU share:
Net income (loss) attributable to iStar Inc. and allocable to HPU holders (in dollars per share)										$ 0.00	$ (120.00)	$ (75.27)
Basic | Common Stock
Numerator for basic earnings per share:
Income (loss) from operations attributable to iStar Inc. and allocable to common shareholders										$ 43,972	$ (52,675)	$ (33,722)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders										43,972	(52,675)	(33,722)
Diluted | Common Stock
Numerator for basic earnings per share:
Income (loss) from operations attributable to iStar Inc. and allocable to common shareholders										54,126	(52,675)	(33,722)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders										54,126	(52,675)	(33,722)
Basic and Diluted | HPU's
Numerator for basic and diluted earnings per HPU share:
Net income (loss) attributable to iStar Inc. and allocable to HPU holders										$ 0	$ (1,080)	$ (1,129)
Denominator for basic and diluted earnings per HPU share:
Weighted average HPUs outstanding for basic and diluted earnings per share (in shares)										0	9	15
Joint venture shares | Common Stock
Denominator for basic and diluted earnings per share:
Add: Effect of joint venture shares (in shares)										298	0	0
1.50% convertible senior unsecured notes | Common Stock
Denominator for basic and diluted earnings per share:
Add: Effect of senior convertible unsecured notes (in shares)										9,868	0	0
3.00% convertible senior unsecured notes | Common Stock
Denominator for basic and diluted earnings per share:
Add: Effect of senior convertible unsecured notes (in shares)										14,764	0	0
[1] All of the Company's outstanding High Performance Units ("HPUs") were repurchased and retired on August 13, 2015 (refer to Note 13).

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