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Subsequent Events (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]    
Debt and Capital Lease Obligations $ 12,070,091,000us-gaap_DebtAndCapitalLeaseObligations $ 11,920,861,000us-gaap_DebtAndCapitalLeaseObligations
Sunesys [Member]    
Subsequent Event [Line Items]    
Business Combination, Consideration 1,000,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_SubsequentEventTypeAxis
= cci_SunesysMember		  
Fiber Miles 10,000cci_FiberMiles
/ us-gaap_SubsequentEventTypeAxis
= cci_SunesysMember		  
Percentage of FIber Miles 60.00%cci_PercentageofFIberMiles
/ us-gaap_SubsequentEventTypeAxis
= cci_SunesysMember		  
Securitized Debt [Member]    
Subsequent Event [Line Items]    
Debt and Capital Lease Obligations 3,562,927,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember		 3,573,208,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
2015 Tower Revenue Notes [Member] [Member] | Securitized Debt [Member]    
Subsequent Event [Line Items]    
Debt and Capital Lease Obligations 1,000,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_A2015TowerRevenueNotesMemberMember		  
2015 Tower Revenue Notes 3.222% due 2042 [Member] | Securitized Debt [Member]    
Subsequent Event [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.22%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_A2015TowerRevenueNotes3.222due2042Member		 [1],[2]  
Debt and Capital Lease Obligations 300,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_A2015TowerRevenueNotes3.222due2042Member		  
2015 Tower Revenue Notes 3.663% due 2045 [Member] | Securitized Debt [Member]    
Subsequent Event [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.66%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_A2015TowerRevenueNotes3.663due2045Member		 [1],[2]  
Debt and Capital Lease Obligations 700,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_A2015TowerRevenueNotes3.663due2045Member		  
Fixed Rate Securitized Debt August 2010 Tower Revenue Notes [Member] | Securitized Debt [Member]    
Subsequent Event [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_FixedRateSecuritizedDebtAugust2010TowerRevenueNotesMember		 [1],[2]  
Debt and Capital Lease Obligations 1,550,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_FixedRateSecuritizedDebtAugust2010TowerRevenueNotesMember		 1,550,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_FixedRateSecuritizedDebtAugust2010TowerRevenueNotesMember
August 2010 Tower Revenue Notes ARD [Domain] | Fixed Rate Securitized Debt August 2010 Tower Revenue Notes [Member] | Securitized Debt [Member]    
Subsequent Event [Line Items]    
Debt and Capital Lease Obligations $ 250,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= cci_SecuritizedDebtMember
/ us-gaap_LongtermDebtTypeAxis
= cci_FixedRateSecuritizedDebtAugust2010TowerRevenueNotesMember
/ cci_RepaymentsOfDebtMaturityDateAxis
= cci_August2010TowerRevenueNotesARDDomain		  
[1] Represents the weighted-average stated interest rate.
[2] See the 2014 Form 10-K, including note 7, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.