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Costs and Estimated Earnings on Uncompleted Contracts (Summary of Costs and Estimated Earnings on Uncompleted Contracts) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Costs and Estimated Earnings on Uncompleted Contracts [Abstract]
Costs incurred on uncompleted contracts	$ 139,461	$ 74,474
Estimated earnings	51,207	31,514
Billings to date	(146,192)	(92,082)
Costs and estimated earnings on uncompleted contracts	$ 44,476	$ 13,906

X

- Definition

Contract with Customer, Billing to Date

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Contract with Customer, Estimated Earnings

+ References

No definition available.

+ Details

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Namespace Prefix:	sbac_
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X

- Definition

Contract with Customer, Net Asset (Liability)

+ References

No definition available.

+ Details

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Namespace Prefix:	sbac_
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X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-3

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- References

No definition available.

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