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Commitments and Contingencies - Legal (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Commitments and Contingencies. |  |
Bid and completion bonds issued and outstanding | $ 8,200 | $ 8,100
Remaining performance obligation on the bonded projects. | $ 2,500 | $ 3,000

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