Quarterly Financial Data (Schedule Of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Revenues	$ 404,734	$ 393,293	$ 383,420	$ 345,549	$ 335,396	$ 332,094	$ 324,305	$ 313,071	$ 1,526,996	$ 1,304,866	$ 954,084
Operating income	96,590	89,484	83,317	67,132	59,445	63,902	49,534	56,764	336,523	229,645	147,146
Depreciation, accretion, and amortization	(162,214)	(159,410)	(161,005)	(144,443)	(133,328)	(133,281)	(141,089)	(125,636)	(627,072)	(533,334)	(408,467)
Loss from extinguishment of debt, net	(1,124)	(14,893)	(8,236)	(1,951)	(336)	(3)	(5,618)	(142)	(26,204)	(6,099)	(51,799)
Net income (loss) attributable to SBA Communications Corporation	$ 388	$ (16,624)	$ (9,467)	$ 1,408	$ (19,164)	$ 21,531	$ (35,899)	$ (22,377)	$ (24,295)	$ (55,909)	$ (181,037)
Net income (loss) per common share - basic and diluted	$ 0.00	$ (0.13)	$ (0.07)	$ 0.01					$ (0.19)	$ (0.44)	$ (1.51)
Net (loss) income per common share - basic					$ (0.15)	$ 0.17	$ (0.28)	$ (0.18)
Net (loss) income per common share - diluted					$ (0.15)	$ 0.16	$ (0.28)	$ (0.18)