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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, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss attributable to SBA Communications Corporation	$ (11,745)	$ (127,058)
Basic weighted-average shares outstanding	109,469	111,908
Diluted weighted-average shares outstanding	109,469	111,908
Net loss per common share attributable to SBA Communications Corporation:
Basic	$ (0.11)	$ (1.14)
Diluted	$ (0.11)	$ (1.14)

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