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Reportable Segments - Revenue and Total Assets by Geographic Area (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues and total assets by geographic area
% of Revenue	100.00%	100.00%	100.00%
Non-United States
Revenues and total assets by geographic area
% of Revenue	2.90%	0.30%	0.60%
% of total assets	2.80%	1.00%

X

- Definition

The percentage of revenue to total revenue.

+ References

No definition available.

+ Details

Name:	prim_RevenuePercentage
Namespace Prefix:	prim_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of assets to total assets.

+ References

No definition available.

+ Details

Name:	prim_TotalAssetsPercentage
Namespace Prefix:	prim_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_StatementGeographicalAxis=prim_NonUnitedStatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: