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Discontinued Operations Gain on Sale of Subsidiary (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Installment payment received for sale of subsidiary	$ 117,384

X

- Definition

Installment payment received for sale of subsidiary

+ References

No definition available.

+ Details

Name:	cci_Installmentpaymentreceivedforsaleofsubsidiary
Namespace Prefix:	cci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration