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								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to SBA Communications Corporation	$ 105,781	$ 22,568	$ 22,813	$ (127,058)	$ 67,350	$ 21,679	$ 31,973	$ 25,989	$ 24,104	$ 146,991	$ 47,451
Basic weighted-average shares outstanding									111,532	112,809	114,909
Dilutive impact of stock options, RSUs, and PSUs									1,933	1,884	1,606
Diluted weighted-average shares outstanding									113,465	114,693	116,515
Net income per common share attributable to SBA Communications Corporation:
Basic									$ 0.22	$ 1.30	$ 0.41
Diluted									$ 0.21	$ 1.28	$ 0.41