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Debt (Schedule Of Cash And Non-Cash Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013 1.875% Convertible Senior Notes [Member]	Sep. 30, 2014 1.875% Convertible Senior Notes [Member]	Sep. 30, 2014 4.0% Convertible Senior Notes [Member]	Sep. 30, 2013 4.0% Convertible Senior Notes [Member]	Sep. 30, 2014 4.0% Convertible Senior Notes [Member]	Sep. 30, 2013 4.0% Convertible Senior Notes [Member]	Apr. 29, 2009 4.0% Convertible Senior Notes [Member]	Sep. 30, 2014 8.25% Senior Notes [Member]	Sep. 30, 2013 8.25% Senior Notes [Member]	Sep. 30, 2014 8.25% Senior Notes [Member]	Sep. 30, 2013 8.25% Senior Notes [Member]	Jul. 24, 2009 8.25% Senior Notes [Member]	Sep. 30, 2014 5.625% Senior Notes [Member]	Sep. 30, 2013 5.625% Senior Notes [Member]	Sep. 30, 2014 5.625% Senior Notes [Member]	Sep. 30, 2013 5.625% Senior Notes [Member]	Sep. 28, 2012 5.625% Senior Notes [Member]	Sep. 30, 2014 5.75% Senior Notes [Member]	Sep. 30, 2013 5.75% Senior Notes [Member]	Sep. 30, 2014 5.75% Senior Notes [Member]	Sep. 30, 2013 5.75% Senior Notes [Member]	Jul. 13, 2012 5.75% Senior Notes [Member]	Sep. 30, 2014 4.875% Senior Notes [Member]	Sep. 30, 2014 4.875% Senior Notes [Member]	Jul. 01, 2014 4.875% Senior Notes [Member]	Sep. 30, 2014 2010 Secured Tower Revenue Securities [Member]	Sep. 30, 2013 2010 Secured Tower Revenue Securities [Member]	Sep. 30, 2014 2010 Secured Tower Revenue Securities [Member]	Sep. 30, 2013 2010 Secured Tower Revenue Securities [Member]	Sep. 30, 2014 2012 Secured Tower Revenue Securities [Member]	Sep. 30, 2013 2012 Secured Tower Revenue Securities [Member]	Sep. 30, 2014 2012 Secured Tower Revenue Securities [Member]	Sep. 30, 2013 2012 Secured Tower Revenue Securities [Member]	Sep. 30, 2014 2013 Secured Tower Revenue Securities [Member]	Sep. 30, 2013 2013 Secured Tower Revenue Securities [Member]	Sep. 30, 2014 2013 Secured Tower Revenue Securities [Member]	Sep. 30, 2013 2013 Secured Tower Revenue Securities [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Sep. 30, 2013 Revolving Credit Facility [Member]	Sep. 30, 2014 Revolving Credit Facility [Member]	Sep. 30, 2013 Revolving Credit Facility [Member]	Sep. 30, 2013 2011 Term Loan [Member]	Sep. 30, 2014 2011 Term Loan [Member]	Sep. 30, 2013 2011 Term Loan [Member]	Sep. 30, 2014 2012-1 Term Loan [Member]	Sep. 30, 2013 2012-1 Term Loan [Member]	Sep. 30, 2014 2012-1 Term Loan [Member]	Sep. 30, 2013 2012-1 Term Loan [Member]	Sep. 30, 2013 2012-2 Term Loan [Member]	Sep. 30, 2014 2012-2 Term Loan [Member]	Sep. 30, 2013 2012-2 Term Loan [Member]	Sep. 30, 2014 2014 Term Loan [Member]	Sep. 30, 2014 2014 Term Loan [Member]	Sep. 30, 2014 Other [Member]	Sep. 30, 2013 Other [Member]	Sep. 30, 2014 Other [Member]	Sep. 30, 2013 Other [Member]
Debt Instrument [Line Items]
Cash Interest	$ 78,170	$ 62,987	$ 215,695	$ 185,569	$ 2,670		$ 3,675	$ 4,999	$ 12,520	$ 14,999		$ 2,458	$ 5,027	$ 12,513	$ 15,082		$ 7,031	$ 7,031	$ 21,094	$ 21,094		$ 11,500	$ 11,500	$ 34,500	$ 34,500		$ 9,141	$ 9,141		$ 14,346	$ 14,349	$ 43,036	$ 43,037	$ 4,521	$ 4,521	$ 13,564	$ 13,564	$ 10,804	$ 10,804	$ 32,413	$ 19,588	$ 1,007	$ 856	$ 3,279	$ 3,338	$ 1,730	$ 696	$ 8,802	$ 1,222	$ 1,123	$ 3,336	$ 3,516	$ 1,054	$ 424	$ 5,362	$ 12,458	$ 28,911	$ 7	$ (7)	$ 268	$ 17
Non-cash Interest	$ 8,236	$ 9,642	$ 26,832	$ 39,151	$ 10,434		$ 7,934	$ 9,570	$ 26,266	$ 28,446		$ 24	$ 46	$ 121	$ 135												$ 157	$ 157																		$ 16	$ 7	$ 85					$ 10	$ 4	$ 51	$ 121	$ 277
Debt instrument, interest rate, stated percentage						1.875%	4.00%		4.00%		4.00%	8.25%		8.25%		8.25%	5.625%		5.625%		5.625%	5.75%		5.75%		5.75%	4.875%	4.875%	4.875%

X

- Definition

Represents the portion of cash interest incurred in the period on debt arrangements that was charged against earnings.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Represents the portion of non-cash interest incurred in the period on debt arrangements that was charged against earnings.

+ References

No definition available.

+ Details

Name:	sbac_NoncashInterestExpense
Namespace Prefix:	sbac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
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- Details

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