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Acquisitions (Schedule Of Acquisition Capital Expenditures) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]      
Towers and related intangible assets $ 1,540,258,000sbac_TowersAndRelatedIntangibleAssetsAcquisitions [1] $ 628,423,000sbac_TowersAndRelatedIntangibleAssetsAcquisitions [1] $ 2,205,859,000sbac_TowersAndRelatedIntangibleAssetsAcquisitions [1]
Ground lease land purchases 44,964,000sbac_GroundLeaseLandPurchases [2] 48,956,000sbac_GroundLeaseLandPurchases [2] 46,865,000sbac_GroundLeaseLandPurchases [2]
Total cash acquisition capital expenditures 1,585,222,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 677,379,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 2,252,724,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Ground lease extensions 10,800,000sbac_GroundLeaseExtensions 9,100,000sbac_GroundLeaseExtensions 9,700,000sbac_GroundLeaseExtensions
Brazilian Acquisiton [Member]      
Business Acquisition [Line Items]      
Total cash acquisition capital expenditures $ 175,900,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= sbac_BrazilianAcquisitonMember		    
[1] Total acquisition capital expenditures for the year ended December 31, 2013, included $175.9 million related to an acquisition in Brazil which closed in the fourth quarter of 2012 and funded on January 4, 2013.
[2] In addition, the Company paid $10.8 million, $9.1 million, and $9.7 million for ground lease extensions during the years ending 2014, 2013, and 2012, respectively. The Company recorded these amounts in prepaid rent on its Consolidated Balance Sheet.