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
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net (loss) income attributable to SBA Communications Corporation	$ (127,058)	$ 25,989
Basic weighted-average shares outstanding	111,908	112,708
Dilutive impact of stock options and restricted shares		1,636
Diluted weighted-average shares outstanding	111,908	114,344
Net (loss) income per common share attributable to SBA Communications Corporation:
Basic	$ (1.14)	$ 0.23
Diluted	$ (1.14)	$ 0.23