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Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue Recognition
External freight billed to customers included in revenue	$ 11.7	$ 11.4

X

- Definition

Not available.

+ References

No definition available.

+ Details

Name:	uslm_RevenueAbstract
Namespace Prefix:	uslm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents fees charged to customers for the delivery, generally by postal or freight service providers, of product or goods purchased.

+ References

No definition available.

+ Details

Name:	uslm_ShippingAndHandlingRevenues
Namespace Prefix:	uslm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration