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Business and Organization (Details) (USD $) In Billions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Business and Organization [Abstract]
Investment across a range of real estate sectors over the past two decades (more than $35 billion at December 31, 2012)	$ 35
Period over which the entity has made the investment across a range of real estate	20 years

X

- Details

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- Definition

Represents the amount invested across a range of real estate sectors by the entity over a period of time.

+ References

No definition available.

+ Details

Name:	star_RealEstateInvestment
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Real Estate, Investment Period

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration