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Equity (Dividends) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2013
Dividends [Abstract]
Minimum percentage of taxable income (excluding net capital gains) to be distributed in order to qualify as REIT	90.00%star_MinimumPercentageOfTaxableIncomeExcludingCapitalGainsToBeDistributedToQualifyAsReit
Percentage of taxable income (including net capital gains) to be distributed in order to qualify as REIT	100.00%star_PercentageOfTaxableIncomeIncludingCapitalGainsToBeDistributedToQualifyAsReit
Operating loss carryforwards		$ 759.8us-gaap_OperatingLossCarryforwards

X

- Definition

Represents the minimum percentage of taxable income (excluding capital gains) to be distributed in order to qualify as REIT.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of taxable income (including capital gains) to be distributed in order to qualify as REIT.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
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- Details

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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

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