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Nature of Business (Details)	12 Months Ended	1 Months Ended
	Dec. 31, 2012 item	Mar. 31, 2012 Sprint
Asset purchase agreement
Number of acquisitions	4
Period for which the acquiree name is allowed to be used		3 years

X

- Definition

Represents the number of business acquisitions made by the entity.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the period for which the entity is allowed to use the acquiree name as per the purchase agreement.

+ References

No definition available.

+ Details

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

X

- Details

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