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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details) (USD $) | 3 Months Ended | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jan. 31, 2014 | Jan. 31, 2015 | Jun. 30, 2013 | Jan. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 3,238,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,075,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Unrecognized compensation cost | 3,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |
Weighted-average period to recognize the unrecognized compensation cost | 1 year 7 months 2 days |  |  |  |  |
Deferred compensation share-based arrangements, liability, current and noncurrent | $ 10,500,000 us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent |  |  |  |  |
Long-term Incentive Plan 2006 and 2009 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for issuance | 3,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = star_LongTermIncentivePlan2006And2009Member |  |  |  |  |
Employees | Common Stock Subject to Sales Restriction |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vested, Number of Shares | 318,482 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = star_CommonStockSubjecttoSalesRestrictionMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Granted, Number of Shares | 318,482 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = star_CommonStockSubjecttoSalesRestrictionMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Restricted shares awarded | 189,241 us-gaap_RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings / us-gaap_AwardTypeAxis = star_CommonStockSubjecttoSalesRestrictionMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Sale restriction period | 2 years |  |  |  |  |
Employees | Service Based Restricted Stock Units Vesting on December 31, 2017 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted units |  |  |  |  |  | 64,196 star_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedNumber / us-gaap_AwardTypeAxis = star_ServiceBasedRestrictedStockUnitsVestingonDecember312017Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember
Non-vested, outstanding (in shares) | 64,196 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_ServiceBasedRestrictedStockUnitsVestingonDecember312017Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Employees | Performance-based restricted stock units vesting on December 31, 2016 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested, outstanding (in shares) | 50,116 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312016Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Risk-free interest rate |  |  | 0.76%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312016Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |
Expected stock price volatility |  |  | 44.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312016Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |
Employees | Performance-based restricted stock units vesting on December 31, 2016 | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 0.00%star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPercentage / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312016Member / us-gaap_RangeAxis = us-gaap_MinimumMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |
Employees | Performance-based restricted stock units vesting on December 31, 2016 | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 200.00%star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPercentage / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312016Member / us-gaap_RangeAxis = us-gaap_MaximumMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |
Employees | Performance Based Restricted Stock Units Vesting on December 31, 2017 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted units |  |  |  |  |  | 49,650 star_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedNumber / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312017Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember
Non-vested, outstanding (in shares) | 49,650 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312017Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Risk-free interest rate |  |  |  | 0.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312017Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |
Expected stock price volatility |  |  |  | 28.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312017Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |
Employees | Performance Based Restricted Stock Units Vesting on December 31, 2017 [Member] | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 0.00%star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPercentage / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312017Member / us-gaap_RangeAxis = us-gaap_MinimumMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |
Employees | Performance Based Restricted Stock Units Vesting on December 31, 2017 [Member] | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  |  | 200.00%star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingPercentage / us-gaap_AwardTypeAxis = star_PerformanceBasedRestrictedStockUnitsVestingonDecember312017Member / us-gaap_RangeAxis = us-gaap_MaximumMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |
Employees | Service Based Restricted Stock Units Vesting on December 31, 2016 [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested, outstanding (in shares) | 64,552 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_ServiceBasedRestrictedStockUnitsVestingonDecember312016Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Employees | Service-based restricted stock units vesting on February 1, 2016 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested, outstanding (in shares) | 194,582 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_ServicebasedRestrictedStockUnitsVestingonFebruary12016Member / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Employees | Service based restricted stock units with specified vesting dates |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Non-vested, outstanding (in shares) | 10,666 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_ServiceBasedRestrictedStockUnitsWithSpecifiedVestingTermsMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_EmployeesMember |  |  |  |  |
Employees | Service based restricted stock units with specified vesting dates | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting term |  |  |  |  | 3 years |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Number + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Sale Restriction Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Percentage + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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