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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Related party transactions
Lease payments to related party	$ 383	$ 398	$ 763	$ 797
SIGI
Related party transactions
Lease payments to related party			441	471
Roger Newnham
Related party transactions
Lease payments to related party			145	150
Lemmie Rockford
Related party transactions
Lease payments to related party			45	45
Quality RE Partners
Related party transactions
Lease payments to related party			$ 132	$ 132
Number of former shareholders owning leased property			3
Number of current employees owning leased property			2

X

- Definition

Represents the number of current employees out of the former shareholders who own leased property.

+ References

No definition available.

+ Details

Name:	prim_NumberOfCurrentEmployeesOutOfFormerShareholdersOwningLeasedProperty
Namespace Prefix:	prim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of former shareholders who own leased property.

+ References

No definition available.

+ Details

Name:	prim_NumberOfFormerShareholdersOwningLeasedProperty
Namespace Prefix:	prim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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