Concentration Of Credit Risk (Summary Of Significant Customers And Percentage Of Total Revenue For Specified Time Periods Derived From Such Customers) (Details) (Revenue [Member])	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Sprint [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	24.90%	[1]	23.90%	[1]	21.90%	[1]
AT&T [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	19.00%		20.30%		23.80%
T-Mobile [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	17.30%	[2]	17.20%	[2]	13.50%	[2]
Verizon [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	11.10%		12.70%		14.80%
Site Leasing Revenue [Member] | Sprint [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	28.50%		26.80%		24.60%
Site Leasing Revenue [Member] | AT&T [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	21.90%		22.90%		26.80%
Site Leasing Revenue [Member] | T-Mobile [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	18.70%		18.60%		14.20%
Site Leasing Revenue [Member] | Verizon [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	12.10%		13.20%		15.50%
Site Development Revenue [Member] | Ericsson, Inc [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	34.50%		24.50%		9.00%
Site Development Revenue [Member] | Nsoro [Member]
Concentration Risk [Line Items]
Concentration risk percentage of revenue	3.00%		16.20%		35.60%

[1] Prior year amounts have been adjusted to reflect the merger of Sprint and Clearwire.

[2] Prior year amounts have been adjusted to reflect the merger of T-Mobile and Metro PCS.