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Stock-Based Compensation - Schedule of RSU and PRSU Award Activity (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Restricted Stock Units (RSUs)    
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted Average Grant Date Fair Value, Grants (per share) $ 29.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Weighted Average Grant Date Fair Value, Vested (per share) $ 23.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 24.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]    
Grants 388,506us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Vested (352,233)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Forfeited (13,509)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Performance Restricted Stock Units (PRSUs)    
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted Average Grant Date Fair Value, Grants (per share) $ 29.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Weighted Average Grant Date Fair Value, Vested (per share) $ 30.47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Weighted Average Grant Date Fair Value, Forfeited (per share) $ 30.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]    
Grants 225,694us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Vested (63,642)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Forfeited (25,751)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Restricted stock units (“RSUs”) and performance-based RSUs (“PRSUs”)    
RSUs and PRSUs, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted Average Grant Date Fair Value, Non-Vested, Beginning Balance (per share)   $ 21.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
Weighted Average Grant Date Fair Value, Non-Vested, Ending Balance (per share) $ 25.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
$ 21.92us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
RSUs and PRSUs, Nonvested, Number of Shares [Roll Forward]    
Non-vested as of beginning of period   1,278,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
Non-vested as of end of period 1,437,667us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember
1,278,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= out_RestrictedStockUnitsandPerformanceRestrictedStockUnitsMember