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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
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Numerator for basic earnings per share: |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  | $ 25,708 | $ (67,449) | $ (46,420)
Income from discontinued operations |  |  |  |  |  | 18,264 | 14,774 | 12,698
Net income (loss) allocable to common shareholders |  |  |  |  |  | 43,972 | (52,675) | (33,722)
Numerator for diluted earnings per share: |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  | 25,715 | (67,449) | (46,420)
Income from discontinued operations |  |  |  |  |  | 18,264 | 14,774 | 12,698
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  | $ 43,979 | $ (52,675) | $ (33,722)
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |
Weighted average number of shares, Basic (in shares) |  |  |  |  |  | 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
Add: Effect of joint venture shares (in shares) |  |  |  |  |  | 298 | 0 | 0
Weighted average common shares outstanding for diluted earnings per common share (in shares) |  |  |  |  |  | 73,835 | 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) |  |  |  |  |  | $ 0.35 | $ (0.79) | $ (0.55)
Income from discontinued operations (in dollars per share) |  |  |  |  |  | 0.25 | 0.17 | 0.15
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) |  |  |  |  |  | 0.35 | (0.79) | (0.55)
Income from discontinued operations (in dollars per share) |  |  |  |  |  | 0.25 | 0.17 | 0.15
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  | $ 0.60 | $ (0.62) | $ (0.40)
Denominator for basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |
Weighted average number of HPU share—Basic and diluted (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 | $ (153.67) | $ (103.54)
HPU's |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to HPU holders |  |  |  |  |  | $ 0 | $ (1,383) | $ (1,553)
Income from discontinued operations |  |  |  |  |  | 0 | 303 | 424
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 number of HPU share—Basic and diluted (in shares) |  | 0 | 7 | 15 | 15 | 0 | 9 | 15
Basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to HPU holders |  |  |  |  |  | $ 0.00 | $ (153.67) | $ (103.54)
Income from discontinued operations |  |  |  |  |  | 0.00 | 33.67 | 28.27
Net income (loss) attributable to iStar Inc. and allocable to HPU holders (in dollars per share) |  |  |  |  |  | $ 0.00 | $ (120.00) | $ (75.27)
[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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- Definition This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. + References No definition available. + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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