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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Information [Line Items]
Interest paid	$ 357,094	$ 364,147
Income taxes paid	11,740	23,865
Increase (decrease) in accounts payable for purchases of property and equipment	1,390	(5,399)
Purchase of property and equipment under capital leases and installment purchases	$ 40,295	41,331
Installment payment receivable for sale of subsidiary		$ 117,384

X

- Definition

Increase (Decrease) in accounts payable for purchases of property and equipment

+ References

No definition available.

+ Details

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Namespace Prefix:	cci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Installment payment received for sale of subsidiary

+ References

No definition available.

+ Details

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

X

- Definition

Purchase of property and equipment under capital leases and installment purchases

+ References

No definition available.

+ Details

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Namespace Prefix:	cci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Supplemental Cash Flow Information [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	cci_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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Period Type:	duration

X

- Definition

The amount of cash paid for interest during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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