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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 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                      
Net income attributable to SBA Communications Corporation $ 67,350 $ 21,679 $ 31,973 $ 25,989 $ 57,152 $ 16,144 $ (57,392) $ 31,547 $ 146,991 $ 47,451 $ 103,654
Basic weighted-average shares outstanding                 112,809 114,909 119,860
Dilutive impact of stock options and restricted shares                 1,884 1,606 1,162
Diluted weighted-average shares outstanding                 114,693 116,515 121,022
Net income per common share attributable to SBA Communications Corporation:                      
Basic                 $ 1.30 $ 0.41 $ 0.86
Diluted                 $ 1.28 $ 0.41 $ 0.86