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Long-Term Debt - Schedule of Long-Term Debt Instruments (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Long-term debt $ 1,598,200,000us-gaap_LongTermDebtNoncurrent $ 0us-gaap_LongTermDebtNoncurrent $ 0us-gaap_LongTermDebtNoncurrent
Weighted average cost of debt 4.20%us-gaap_DebtWeightedAverageInterestRate 0.00%us-gaap_DebtWeightedAverageInterestRate  
Secured Debt | Term loan, due 2021      
Debt Instrument [Line Items]      
Long-term debt 798,200,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= out_TermLoanDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= out_TermLoanDue2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
Senior Notes      
Debt Instrument [Line Items]      
Long-term debt 800,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Senior Notes | 5.250% senior unsecured notes, due 2022      
Debt Instrument [Line Items]      
Long-term debt 400,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= out_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= out_SeniorNotesDue2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Senior Notes | 5.625% senior unsecured notes, due 2024      
Debt Instrument [Line Items]      
Long-term debt $ 400,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= out_SeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 $ 0us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= out_SeniorNotesDue2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember