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Business Combinations (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended					0 Months Ended		0 Months Ended			0 Months Ended
	Mar. 11, 2013 FSSI acquisition item	Mar. 11, 2013 FSSI acquisition Non-competition and non-solicitation agreement with a key employee	Mar. 11, 2013 FSSI acquisition Earnout target period for remainder of the year ending December 31, 2013 Minimum	Mar. 11, 2013 FSSI acquisition 2013 earnout target	Mar. 11, 2013 FSSI acquisition 2014 earnout target	Mar. 11, 2013 FSSI acquisition 2014 earnout target Minimum	Mar. 11, 2013 FSSI acquisition 2015 earnout target	Mar. 11, 2013 FSSI acquisition 2015 earnout target Minimum	Jun. 05, 2014 Vadnais Corporation	Jun. 05, 2014 Vadnais Corporation 2014 earnout target	Jun. 05, 2014 Vadnais Corporation 2014 earnout target Minimum
2013 Acquisition - FSSI
Fair value of consideration	$ 2,377								$ 6,400
Number of future potential payments based on agreed upon contingencies	3
Contingent consideration in cash				500	500		500			900
Pretax income threshold for measuring financial performance			553			2,502		4,227			2,800
Estimated fair value of the potential contingent consideration	702								729
Initial payment		$ 1,000
Period of employment, non-competition and non-solicitation agreement with a key employee		5 years
Amortization period of agreement		5 years

X

- Definition

Represents the period of employment, non-competition and non-solicitation agreement with a key employee related to a business combination.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount paid under the asset purchase agreement related to the intangible assets in a business combination.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of future potential payments in a business combination based on agreed upon contingencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	prim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of pretax income to be achieved by the acquiree in earnout target period to measure cash payment of potential contingent consideration.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

+ Details

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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