Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012 years		Dec. 31, 2011
Development in Process	$ 52,200,000		$ 43,300,000
Increase (decrease) in restricted cash for operating activities	(1,637,000)		11,475,000		(17,902,000)
Increase (decrease) in restricted cash for investing activities	8,067,000		(46,282,000)	[1]	(15,430,000)
Net cash provided by (used from) financing activities	385,982,000	[2]	(288,763,000)	[2]	1,979,000
Useful life of site rental contracts and customer relationships (years)	20 years
Revenue recognition, non-cancelable lease term, minimum (years)			5
Revenue recognition, non-cancelable lease term, maximum (years)			15
Portion of company site rental costs that are ground lease expenses	0.667
Ground Lease Agreement Initial Term	5 years
Percentage of tax position that is likely of being realized upon ultimate settlement	50.00%
Asset write-down charges	14,863,000		15,548,000		22,285,000
Maximum [Member]
Original Maturities of Highly Liquid Investments	3 months
Wireless Infrastructure [Member]
Property, plant and equipment estimated useful life, maximum (years)	20 years
Wireless Infrastructure [Member] | Maximum [Member]
Property, plant and equipment estimated useful life, maximum (years)	20 years
Acquired [Member]
Increase (decrease) in restricted cash for investing activities			46,300,000
Restricted Cash Held By Trustee [Member] [Member]
Net cash provided by (used from) financing activities			316,600,000
Property, Plant and Equipment [Member]
Asset write-down charges	$ 10,200,000		$ 12,000,000		$ 16,100,000

[1] Inclusive of $46.3 million of acquired restricted cash.

[2] Inclusive of $316.6 million of cash held by the trustee as of December 31, 2012 and subsequently released to retire the 7.75% Secured Notes in January 2013.