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Basis of Presentation - Accounts Receivable Securitization Facility (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Facility term	2 years
Accounts receivable from securitization		$ 75.0		$ 75.0
Sale of accounts receivable				75.0
Cash proceeds from facility				10.0	$ 65.0
Repayments to the facility				10.0	0.0
Accounts receivable securitization facility fee		1.3	$ 0.5	4.0	$ 0.5
Special Purpose Entity | Accounts receivable, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivables		$ 232.1		$ 232.1
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable from securitization	$ 150.0

X

- Definition

Amount of fees from accounts receivable securitization.

+ References

No definition available.

+ Details

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Namespace Prefix:	prim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The period over which the entity entered for securitization of accounts receivable.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as operating activities.

+ References

No definition available.

+ Details

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X

- Definition

Repayments of securitizations of receivables treated as collateralized borrowings, which are classified as operating activities.

+ References

No definition available.

+ Details

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- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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

X

- Definition

The amount owed to the reporting entity by counterparties in securitized loan transactions.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of decrease from sale of accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-11

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Period Type:	duration

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