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v3.20.1

Nature of Business (Details) | 3 Months Ended
--- | ---
Mar. 31, 2020 segment
Nature of Business |
Number of reportable segments | 5
Carlsbad |
Nature of Business |
Ownership percentage | 50.00%

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- References No definition available. + Details
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Namespace Prefix: | prim_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=prim_CarlsbadConstructorsJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |