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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) loan	Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	2
Pre-modification outstanding recorded investment	$ 11,600,000
Unfunded commitments, troubled debt restructurings		$ 0
Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pre-modification outstanding recorded investment	$ 5,800,000

X

- Definition

The number of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of the outstanding unfunded commitment related to financing receivables that has been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings before the financing receivable has been modified.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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