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v3.5.0.2

General Business (Details) | Sep. 30, 2016
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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%

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

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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