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Acquisitions (Schedule of Acquisition Activity) (Details) - item | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Nov. 30, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Acquisitions [Abstract] |  |  |  |  |
Tower acquisitions (number of towers) | 941 | 1,641 | 1,316 | 1,425 | 531

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- Definition Number of towers acquired. + References No definition available. + Details
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Namespace Prefix: | sbac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration