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Debt (1.875% Convertible Senior Notes Due 2013) (Narrative) (Details) (1.875% Convertible Senior Notes [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended 3 Months Ended
May 16, 2008
Sep. 30, 2013
Dec. 31, 2014
Debt Instrument [Line Items]      
Debt instrument, issuance date May 16, 2008    
Convertible senior notes issued $ 550.0us-gaap_NotesIssued1    
Debt instrument, interest rate, stated percentage 1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage   1.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
Interest payable dates May 1 and November 1    
Debt instrument, maturity date May 01, 2013    
Lehman Brothers [Member]
      
Debt Instrument [Line Items]      
Gain on a sale of a bankruptcy claim   $ 27.3sbac_GainsOnSalesOfBankruptcyClaims
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Class A Common Stock [Member]      
Debt Instrument [Line Items]      
Conversion rate 0.0241196us-gaap_DebtInstrumentConvertibleConversionRatio1
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Per share conversion price $ 41.46us-gaap_DebtInstrumentConvertibleConversionPrice1
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Conversion premium 20.00%sbac_ConversionPremiumOnClassCommonStock
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Last reported selling price $ 34.55sbac_LastReportedSellingPriceOfClassCommonStock
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