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Cash, Cash Equivalents, and Restricted Cash (Narrative) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Restricted Cash And Cash Equivalents Items [Line Items] |  |
Surety, payment and performance bonds | $ 42,000,000.0 | $ 41,800,000
Collateral payment for performance bonds | 0 | 0
Workers Compensation Policy [Member] |  |
Restricted Cash And Cash Equivalents Items [Line Items] |  |
Collateral | $ 2,300,000 | $ 2,300,000

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- Definition Collateral for surety payment and performance bonds. + References No definition available. + Details
Name: | sbac_CollateralForSuretyPaymentAndPerformanceBonds
Namespace Prefix: | sbac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_EscrowDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. + References No definition available. + Details
Name: | us-gaap_RestrictedInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis=sbac_WorkersCompensationPolicyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |