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General (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018 item
Company owned tower sites | 29,578
Domestic [Member] |
Company owned tower sites | 16,263
International [Member] |
Company owned tower sites | 13,315

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- Definition Company owned tower sites. + 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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=sbac_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |