Restricted Cash (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Restricted Cash [Abstract]
Surety, payment and performance bonds	$ 38.9sbac_SuretyPaymentAndPerformanceBonds	$ 38.3sbac_SuretyPaymentAndPerformanceBonds
Collateral payment for performance bonds	1.7	1.7
Collateral related to workers compensation policy	$ 2.6	$ 2.6

Collateral for surety payment and performance bonds.

No definition available.

Name:	sbac_CollateralForSuretyPaymentAndPerformanceBonds
Namespace Prefix:	sbac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant