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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Quarterly Financial Information [Line Items]

Revenue

$ 172,025

$ 120,487

$ 109,185

$ 112,857

$ 109,950

$ 113,486

$ 129,843

$ 108,749

$ 514,554

$ 462,028

$ 390,790

Net income (loss)

19,974

5,958

(19,776)

(12,313)

(1,955)

35,491

(3,594)

(14,177)

(6,157)

15,765

(111,233)

Earnings per common share data:

Net income (loss) attributable to iStar Inc.

$ (2,435)

$ 16,469

$ (111,951)

Earnings per share, basic and diluted (in dollars per share)

^[1]

$ (0.62)

$ (0.40)

$ (1.83)

Earnings per HPU share data:

Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share)

^[1]

$ (0.62)

$ (0.40)

$ (2.09)

Weighted average number of HPU shares—basic and diluted

^[1],[2]

9

15

15

Undistributed earnings (loss) allocated to participating securities, Basic

5

2

Undistributed earnings (loss) allocated to participating securities, Diluted

5

2

Common Stock

Earnings per common share data:

Earnings per share, basic and diluted (in dollars per share)

$ (0.62)

$ (0.40)

$ (1.83)

Earnings per HPU share data:

Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share)

(0.62)

(0.40)

(2.09)

HPU

Earnings per common share data:

Earnings per share, basic and diluted (in dollars per share)

(120.00)

(75.27)

(346.80)

Earnings per HPU share data:

Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share)

$ (120.00)

$ (75.27)

$ (396.07)

Weighted average number of HPU shares—basic and diluted

9

15

15

Basic | Common Stock

Earnings per common share data:

Net income (loss) attributable to iStar Inc.

$ 7,685

$ (6,072)

$ (30,950)

$ (22,553)

$ (13,270)

$ 22,327

$ (16,207)

$ (26,572)

Earnings per share, Basic (in dollars per share)

$ (0.16)

$ 0.26

$ (0.19)

$ (0.31)

Weighted average number of shares, Basic

83,162

85,766

85,541

85,497

85,188

85,163

84,916

84,819

Basic | HPU

Earnings per HPU share data:

Net income (loss) attributable to iStar Inc.

$ (442)

$ 744

$ (542)

$ (889)

Earnings per share, Basic (in dollars per share)

$ (29.47)

$ 49.60

$ (36.13)

$ (59.27)

Diluted | Common Stock

Earnings per common share data:

Net income (loss) attributable to iStar Inc.

$ 7,684

$ (6,072)

$ (30,950)

$ (22,553)

$ (13,270)

$ 27,608

$ (16,207)

$ (26,572)

Earnings per share, Diluted (in dollars per share)

$ (0.16)

$ 0.21

$ (0.19)

$ (0.31)

Weighted average number of shares, Diluted

83,581

85,766

85,541

85,497

85,188

130,160

84,916

84,819

Diluted | HPU

Earnings per HPU share data:

Net income (loss) attributable to iStar Inc.

$ (442)

$ 602

$ (542)

$ (889)

Earnings per share, Diluted (in dollars per share)

$ (29.47)

$ 40.13

$ (36.13)

$ (59.27)

Basic and Diluted | Common Stock

Earnings per common share data:

Earnings per share, basic and diluted (in dollars per share)

$ 0.09

$ (0.07)

$ (0.36)

$ (0.26)

Earnings per HPU share data:

Net income (loss) attributable to iStar Inc.

$ 0

$ (94)

$ (1,027)

$ (749)

Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share)

$ 0.00

$ (13.41)

$ (68.47)

$ (49.93)

Basic and Diluted | HPU

Earnings per HPU share data:

Weighted average number of HPU shares—basic and diluted

0

7

15

15

15

15

15

15

[1]	Income (loss) from continuing operations attributable to iStar Inc. was $(96.3) million, $(73.5) million and $(221.5) million for the years ended December 31, 2015, 2014 and 2013, respectively. Refer to Note 15 for details on the calculation of earnings per share.
[2]	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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Name:	star_EarningsPerShareTypeAxis=star_BasicandDilutedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: