Summary of Significant Accounting Policies - Operating cycle (Details)	12 Months Ended
Dec. 31, 2024
Operating cycle
Minimum liquidation period of assets in which significant working capital has been invested	1 year

Represents the minimum liquidation period of assets in which significant working capital has been invested.

No definition available.

Name:	prim_MinimumLiquidationPeriodOfAssetsInWhichSignificantWorkingCapitalInvested
Namespace Prefix:	prim_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration