Debt instrument repayment date.

No definition available.

Name:	sbac_DebtInstrumentRepaymentDate
Namespace Prefix:	sbac_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=sbac_TwoThousandFifteenHyphenOneCTowerSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbac_TwoThousandSixteenHyphenOneCTowerSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbac_TwoThousandTwentyHyphenOneCTowerSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbac_TwoThousandTwentyHyphenTwoCTowerSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbac_TwoThousandTwentyTowerSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sbac_TwoThousandTwentyHyphenTwoRTowerSecuritiesMember
Namespace Prefix:
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Period Type:

Debt (Secured Tower Revenue Securities) (Narrative) (Details) - USD ($)		6 Months Ended
	Jul. 14, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 10,662,000,000	$ 10,414,000,000
2015-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 500,000,000	500,000,000
Debt instrument, interest rate, stated percentage		3.156%
Debt instrument, maturity date		Oct. 08, 2020
2016-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 700,000,000	$ 700,000,000
Debt instrument, interest rate, stated percentage		2.877%
Debt instrument, maturity date		Jul. 09, 2021
Subsequent Event [Member] \| 2020-1C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 750,000,000.0
Debt instrument, interest rate, stated percentage	1.884%
Repayment date of debt instrument	Jan. 09, 2026
Debt instrument, maturity date	Jul. 11, 2050
Subsequent Event [Member] \| 2020-2C Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 600,000,000.0
Debt instrument, interest rate, stated percentage	2.328%
Repayment date of debt instrument	Jan. 11, 2028
Debt instrument, maturity date	Jul. 09, 2052
Subsequent Event [Member] \| 2020 Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,350,000,000
Financing fees	$ 13,600,000
Debt instrument, weighted average interest rate	2.081%
Weighted average life of debt instrument through the anticipated repayment date	6 years 4 months 24 days
Subsequent Event [Member] \| 2015-1C Tower Securities [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	$ 500,000,000.0
Subsequent Event [Member] \| 2016-1C Tower Securities [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	700,000,000.0
Subsequent Event [Member] \| 2020-2R Tower Securities [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 71,100,000
Debt instrument, interest rate, stated percentage	4.336%
Repayment date of debt instrument	Jan. 11, 2028
Debt instrument, maturity date	Jul. 09, 2052