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Stock-Based Compensation - Narrative (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Compensation Not yet Recognized, Share-based Awards Other than Options | $ 31.9 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
Compensation Cost Not yet Recognized, Period for Recognition | 2 years 8 months
Stock options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Compensation Cost Not yet Recognized, Period for Recognition | 2 years 5 months
Compensation Not yet Recognized, Stock Options | $ 0.5 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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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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Balance Type: | na
Period Type: | duration

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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Details
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Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |