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Acquisitions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 1 Months Ended
Mar. 31, 2015
item
Apr. 23, 2015
item
Other Acquisitions [Member]    
Business Acquisition [Line Items]    
Number of towers acquired 59sbac_NumberOfTowersAcquired
/ us-gaap_BusinessAcquisitionAxis
= sbac_OtherAcquisitionsMember		  
Subsequent Event [Member]    
Business Acquisition [Line Items]    
Number of towers acquired   20sbac_NumberOfTowersAcquired
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Cash paid for acquisition   $ 17.6us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember