Earnings Per Share (Weighted-Average Shares of Common Stock Outstanding used in Calculation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) attributable to SBA Communications Corporation	$ 22,568	$ 21,679	$ (81,678)	$ 79,640
Basic weighted-average shares outstanding	111,783	113,037	111,809	112,985
Dilutive impact of stock options, RSUs, and PSUs	1,920	2,147		1,839
Diluted weighted-average shares outstanding	113,703	115,184	111,809	114,824
Net income (loss) per common share attributable to SBA Communications Corporation:
Basic	$ 0.20	$ 0.19	$ (0.73)	$ 0.70
Diluted	$ 0.20	$ 0.19	$ (0.73)	$ 0.69