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Concentration of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2018
Concentration of Credit Risk [Abstract] |
Summary of Significant Customers and Percentage of Total Revenue for Specified Time Periods Derived from such Customers | The following is a list of significant customers (representing at least 10% of revenue for any period reported) and the percentage of total revenue for the specified time periods derived from such customers: ﻿
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of Total Revenues |  |  |  | 2018 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |
﻿AT&T Wireless |  |  |  | 24.0% |  | 25.0% |  | 25.7%
﻿Sprint |  |  |  | 17.9% |  | 15.1% |  | 16.1%
﻿T-Mobile |  |  |  | 16.4% |  | 16.5% |  | 17.0%
﻿Verizon Wireless |  |  |  | 14.7% |  | 15.2% |  | 15.2%
﻿ The Company’s site leasing and site development segments derive revenue from these customers. Client percentages of total revenue in each of the segments are as follows:
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of Domestic Site Leasing Revenue |  |  |  | 2018 |  | 2017 |  | 2016
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﻿AT&T Wireless |  |  |  | 31.9% |  | 32.7% |  | 32.7%
﻿T-Mobile |  |  |  | 20.3% |  | 19.7% |  | 19.6%
﻿Sprint |  |  |  | 19.6% |  | 18.9% |  | 19.8%
﻿Verizon Wireless |  |  |  | 19.0% |  | 19.0% |  | 18.2%
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of International Site Leasing Revenue |  |  |  | 2018 |  | 2017 |  | 2016
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﻿Oi S.A. |  |  |  | 35.5% |  | 42.2% |  | 43.9%
﻿Telefonica |  |  |  | 26.7% |  | 25.7% |  | 26.4%
﻿Claro |  |  |  | 11.4% |  | 10.0% |  | 9.4%
﻿ ﻿
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of Site Development Revenue |  |  |  | 2018 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |
﻿Sprint |  |  |  | 47.1% |  | 12.9% |  | 11.7%
﻿T-Mobile |  |  |  | 16.4% |  | 26.9% |  | 28.4%
﻿Verizon Wireless |  |  |  | 6.4% |  | 12.8% |  | 16.5%
﻿Nokia, Inc. |  |  |  | 3.2% |  | 10.1% |  | 7.1%
﻿

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 + Details
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