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Concentration Of Credit Risk (Summary Of Significant Customers And Percentage Of Total Revenue For Specified Time Periods Derived From Such Customers) (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Domestic Site Leasing Revenue [Member] | AT&T [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 31.10% | [1] | 27.20% | [1] | 29.70% | [1] | 25.80% | [1]
Domestic Site Leasing Revenue [Member] | Sprint [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 25.10% | [2] | 30.80% | [2] | 26.20% | [2] | 30.40% | [2]
Domestic Site Leasing Revenue [Member] | T-Mobile [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 19.10% | [3] | 18.10% | [3] | 19.40% | [3] | 17.90% | [3]
Domestic Site Leasing Revenue [Member] | Verizon [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 14.20% |  | 13.70% |  | 14.00% |  | 13.10% |
International Site Leasing Revenue [Member] | Oi [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 46.20% |  | 1.30% |  | 43.10% |  | 1.20% |
International Site Leasing Revenue [Member] | Telefonica [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 27.20% |  | 49.30% |  | 30.20% |  | 52.00% |
International Site Leasing Revenue [Member] | Digicel [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 4.50% |  | 11.80% |  | 5.00% |  | 12.00% |
Site Development Revenue [Member] | Sprint [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 46.10% | [2] | 1.80% | [2] | 32.20% | [2] | 0.90% | [2]
Site Development Revenue [Member] | Ericsson, Inc [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 16.10% |  | 32.20% |  | 17.20% |  | 38.10% |
Site Development Revenue [Member] | T-Mobile [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 7.40% | [3] | 10.50% | [3] | 8.90% | [3] | 7.90% | [3]
Site Development Revenue [Member] | Verizon [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 10.00% |  | 4.90% |  | 9.80% |  | 4.30% |
Site Development Revenue [Member] | Alcatel-Lucent [Member] |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk percentage of revenue | 0.70% |  | 8.10% |  | 2.50% |  | 10.10% |
[1] | Prior year amounts have been adjusted to reflect the merger of AT&T Wireless and Cricket.
[2] | Prior year amounts have been adjusted to reflect the merger of Sprint and Clearwire.
[3] | Prior year amounts have been adjusted to reflect the merger of T-Mobile and Metro PCS.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 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=35750535&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 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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