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Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Apr. 27, 2011
4.0% Convertible Senior Notes [Member]    
Class of Stock [Line Items]    
Debt instrument stated percentage 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sbac_ConvertibleSeniorNotesFourPointZeroPercentDueTwoThousandFourteenMember		  
Current Stock Repurchase Program [Member] | Class A Common Stock [Member]    
Class of Stock [Line Items]    
Stock repurchase program, authorized $ 300.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= sbac_CurrentStockRepurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 300.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= sbac_CurrentStockRepurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Stock repurchase program, remaining authorization $ 150.0us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= sbac_CurrentStockRepurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember