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Income Taxes (Components Of Provision For Income Taxes) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Current (benefit) provision for taxes, Federal     $ (1,237,000)us-gaap_CurrentFederalTaxExpenseBenefit [1]
Current (benefit) provision for taxes, State 1,099,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit [1] 387,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit [1] 2,702,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit [1]
Current (benefit) provision for taxes, Foreign 7,006,000us-gaap_CurrentForeignTaxExpenseBenefit 4,946,000us-gaap_CurrentForeignTaxExpenseBenefit 3,769,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current 8,105,000us-gaap_CurrentIncomeTaxExpenseBenefit 5,333,000us-gaap_CurrentIncomeTaxExpenseBenefit 5,234,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred (benefit) provision for taxes, Federal income taxes 1,458,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (11,977,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (53,501,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred (benefit) provision for taxes, State and local taxes (887,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (3,272,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (13,750,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred (benefit) provision for taxes, Foreign tax (472,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (9,013,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (1,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred (benefit) provision for taxes, Increase in valuation allowance 431,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 17,620,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 68,612,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Deferred income tax expense benefits 530,000sbac_DeferredIncomeTaxExpenseBenefits (6,642,000)sbac_DeferredIncomeTaxExpenseBenefits 1,360,000sbac_DeferredIncomeTaxExpenseBenefits
Total (benefit) provision for income taxes 8,635,000us-gaap_IncomeTaxExpenseBenefit (1,309,000)us-gaap_IncomeTaxExpenseBenefit 6,594,000us-gaap_IncomeTaxExpenseBenefit
Provision for income taxes on continuing operations   1,500,000sbac_IncomeTaxBenefit  
Federal taxes on continuing operations   1,200,000us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations  
State taxes on continuing operations   $ 300,000us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations  
[1] Included in the 2012 current provision for income taxes on continuing operations is a benefit of $1.5 million that is an offset to the tax expense netted in discontinued operations. Of the $1.5 million benefit, $1.2 million relates to federal taxes and $0.3 million relates to state taxes.