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Stock-Based Compensation Plans and Employee Benefits (401(k) Plan) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Requisite service period | 3 months |  |
Defined contribution plan maximum percentage of matching contribution | 50.00% |  |
Defined contribution plan maximum percentage of employee compensation | 10.00% |  |
Gross contributions made by the Company | $ 1.0 | $ 1.0 | $ 0.9

X
- Definition Represents the maximum percentage of a participant's annual compensation upon which the matching Company contribution is based. + References No definition available. + Details
Name: | star_DefinedContributionPlanMaximumPercentageOfEmployeeCompensationUponWhichCompanyMatchingContributionIsBased
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition At the discretion of the Board of Directors, represents the maximum percentage matching contribution which the Company may make of the first ten percent of the participant's annual compensation. + References No definition available. + Details
Name: | star_DefinedContributionPlanMaximumPercentageOfMatchingContributionCompanyMayMakeOfFirstTenPercentageOfParticipatingEmployeesAnnualCompensationAtDiscretionOfBoardOfDirectors
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period of continuous service with the Company required in order to be eligible to participate in the 401(k) Plan. + References No definition available. + Details
Name: | star_DefinedContributionPlanServiceRequirement
Namespace Prefix: | star_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
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