Concentration Of Credit Risk (Narrative) (Details)	Jun. 30, 2011	Dec. 31, 2010
Concentration Of Credit Risk
Concentration risk percentage of revenue minimum	10.00%
Concentration risk percentage of accounts receivable	56.80%	50.50%
Accounts receivable number of customers	5	5

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sbac_ConcentrationRiskPercentageOfAccountsReceivable

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sbac

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num:percentItemType

Balance Type:

na

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instant