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Concentration of Credit Risk (Tables)
12 Months Ended
Dec. 31, 2019
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:

For the year ended December 31,

Percentage of Total Revenues

2019

2018

2017

AT&T Wireless

23.8%

24.0%

25.0%

T-Mobile

18.2%

16.4%

16.5%

Sprint

16.9%

17.9%

15.1%

Verizon Wireless

14.0%

14.7%

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:

For the year ended December 31,

Percentage of Domestic Site Leasing Revenue

2019

2018

2017

AT&T Wireless

32.1%

31.9%

32.7%

T-Mobile

21.6%

20.3%

19.7%

Sprint

19.0%

19.6%

18.9%

Verizon Wireless

18.6%

19.0%

19.0%

For the year ended December 31,

Percentage of International Site Leasing Revenue

2019

2018

2017

Oi S.A.

31.3%

35.5%

42.2%

Telefonica

26.9%

26.7%

25.7%

Claro

11.6%

11.4%

10.0%

For the year ended December 31,

Percentage of Site Development Revenue

2019

2018

2017

Sprint

37.3%

47.1%

12.9%

T-Mobile

30.2%

16.4%

26.9%

Verizon Wireless

2.9%

6.4%

12.8%

Nokia, Inc.

4.3%

3.2%

10.1%