Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Recently Adopted Accounting Pronouncements In January 2017, the FASB issued new guidance which clarifies the definition of a business in order to assist companies in evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The Company adopted the guidance on January 1, 2018, and the adoption of this guidance did not have a material impact on its condensed consolidated financial statements. In May 2014, the FASB released updated guidance regarding the recognition of revenue from contracts with customers not otherwise addressed by specific guidance (commonly referred to as "ASC 606" or "the revenue recognition standard"). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (1) identify the contracts with the customer; (2) identify the performance obligations in the contract; (3) determine the contract price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. This guidance was effective for the Company on January 1, 2018. The Company's site rental revenues are within the scope of lease accounting and were not impacted by this guidance. Recent Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued new guidance on the recognition, measurement, presentation and disclosure of leases. The new guidance requires lessees to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments for all leases with a term greater than 12 months. The accounting for lessors remains largely unchanged from existing guidance. This guidance is effective for the Company as of January 1, 2019. This guidance is required to be applied, at the Company's election, either using a (1) modified retrospective approach for all leases existing at, or entered into after, the beginning of the earliest comparative period presented, or (2) cumulative-effect approach for all leases existing at, or entered into, after the effective date. The Company expects to apply the guidance using the cumulative-effect approach, thereby applying the new guidance at the effective date, without adjusting the comparative periods and, if necessary, recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Although early adoption is permitted, the Company will not adopt the new guidance prior to January 1, 2019. The Company expects that (1) lessee arrangements will continue to be classified as operating leases under the new guidance; (2) this guidance will have a material impact on its condensed consolidated balance sheet due to the addition of right-of-use assets and lease liabilities for lessee arrangements (which primarily consist of ground leases under the Company's towers); and (3) there will not be a material impact to its condensed consolidated statement of operations and condensed consolidated statement of cash flows. CCIC is in the process of updating certain of its existing information technology systems to integrate the new guidance requirement.

Recently Adopted Accounting Pronouncements

In January 2017, the FASB issued new guidance which clarifies the definition of a business in order to assist companies in evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The Company adopted the guidance on January 1, 2018, and the adoption of this guidance did not have a material impact on its condensed consolidated financial statements.

In May 2014, the FASB released updated guidance regarding the recognition of revenue from contracts with customers not otherwise addressed by specific guidance (commonly referred to as "ASC 606" or "the revenue recognition standard"). The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve that core principle, an entity should apply the following steps: (1) identify the contracts with the customer; (2) identify the performance obligations in the contract; (3) determine the contract price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. This guidance was effective for the Company on January 1, 2018. The Company's site rental revenues are within the scope of lease accounting and were not impacted by this guidance.

Recent Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued new guidance on the recognition, measurement, presentation and disclosure of leases. The new guidance requires lessees to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments for all leases with a term greater than 12 months. The accounting for lessors remains largely unchanged from existing guidance. This guidance is effective for the Company as of January 1, 2019. This guidance is required to be applied, at the Company's election, either using a (1) modified retrospective approach for all leases existing at, or entered into after, the beginning of the earliest comparative period presented, or (2) cumulative-effect approach for all leases existing at, or entered into, after the effective date. The Company expects to apply the guidance using the cumulative-effect approach, thereby applying the new guidance at the effective date, without adjusting the comparative periods and, if necessary, recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Although early adoption is permitted, the Company will not adopt the new guidance prior to January 1, 2019.

The Company expects that (1) lessee arrangements will continue to be classified as operating leases under the new guidance; (2) this guidance will have a material impact on its condensed consolidated balance sheet due to the addition of right-of-use assets and lease liabilities for lessee arrangements (which primarily consist of ground leases under the Company's towers); and (3) there will not be a material impact to its condensed consolidated statement of operations and condensed consolidated statement of cash flows. CCIC is in the process of updating certain of its existing information technology systems to integrate the new guidance requirement.