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General Business (Details)	Sep. 30, 2016
CCAL [Member]
Percentage of Subsidiary Owned by the Company	77.60%
Subject to Capital Lease with Sprint, TMO, or AT&T [Member]
Purchase Option, Percentage of Towers	54.00%

X

- Definition

Purchase Option, Percentage of Towers

+ References

No definition available.

+ Details

Name:	cci_PurchaseOptionPercentageofTowers
Namespace Prefix:	cci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=cci_CcalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cci_ContractualTermsAxis=cci_SubjecttoCapitalLeasewithSprintTMOorATTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: