For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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-Subparagraph (a)
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Concentration of Credit Risk (Narrative) (Details) - Revenue [Member]	1 Months Ended	3 Months Ended
	May 06, 2020	Mar. 31, 2020
T-Mobile [Member] \| Subsequent Event [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	17.70%
Sprint [Member] \| Subsequent Event [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	15.60%
Domestic Site Leasing [Member] \| T-Mobile [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue		22.00%
Domestic Site Leasing [Member] \| Sprint [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue		19.00%
Site Development Revenue [Member] \| T-Mobile [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue		24.90%
Site Development Revenue [Member] \| Sprint [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue		29.70%