Commitments and Contingencies - Legal (Details) - USD ($) $ in Billions	Jun. 30, 2022	Dec. 31, 2021
Commitments and Contingencies.
Bid and completion bonds issued and outstanding	$ 3.1	$ 3.2
Remaining performance obligation on the bonded projects.	$ 1.0	$ 1.2

Represents the remaining performance obligation on the bonded projects.

No definition available.

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