Concentration Of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2011

Concentration Of Credit Risk [Abstract]

Summary Of Significant Customers And The Percentage Of Total Revenue For The Specified Time Periods Derived From Such Customers

	Percentage of Total Revenues   For the year ended December 31,
	2011			2010			2009
AT&T		23.8	%		23.9	%		23.8	%
Sprint		19.8	%		20.4	%		21.9	%
Verizon Wireless		14.8	%		14.8	%		15.4	%
T-Mobile		10.7	%		11.6	%		13.7	%

The Company's site leasing, site development consulting and site development construction segments derive revenue from these customers. Client percentages of total revenue in each of the segments are as follows:

		00.00			00.00			00.00
	Percentage of Site Leasing Revenues For the year ended December 31,
	2011			2010			2009
AT&T		26.8	%		28.0	%		27.7	%
Sprint		22.3	%		23.6	%		25.3	%
Verizon Wireless		15.5	%		15.4	%		16.0	%
T-Mobile		11.2	%		11.7	%		11.8	%

		00.00			00.00			00.00
	Percentage of Site Development Consulting Revenues   For the year ended December 31,
	2011			2010			2009
Verizon Wireless		17.5	%		15.1	%		23.6	%
Nsoro Mastec, LLC		9.1	%		13.4	%		9.3	%
T-Mobile		8.5	%		6.0	%		13.9	%

	Percentage of Site Development Construction Revenues For the year ended December 31,
	2011			2010			2009
Nsoro Mastec, LLC		42.7	%		36.0	%		24.9	%
Ericsson, Inc.		10.1	%		3.0	%		0.3	%
Verizon Wireless		7.3	%		10.2	%		8.3	%
T-Mobile		6.6	%		11.8	%		28.2	%