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Commitments and Contingencies - Legal (Details) - USD ($) $ in Billions	Sep. 30, 2024	Dec. 31, 2023
Commitments and Contingencies.
Bid and completion bonds issued and outstanding	$ 7.4	$ 5.9
Remaining performance obligation on the bonded projects.	$ 2.9	$ 2.7

X

- Definition

Represents the amount of bonds issued and outstanding.

+ References

No definition available.

+ Details

Name:	prim_BondsIssuedAndOutstanding
Namespace Prefix:	prim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the remaining performance obligation on the bonded projects.

+ References

No definition available.

+ Details

Name:	prim_RemainingPerformanceObligationOnBondedProjects
Namespace Prefix:	prim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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