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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)