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Detail of Certain Balance Sheet Accounts - Contracts in Progress (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]
Costs incurred on contracts in progress	$ 6,603,351pwr_CostsIncurredOnContractsInProgress	$ 6,152,507pwr_CostsIncurredOnContractsInProgress
Estimated earnings, net of estimated losses	1,111,657pwr_EstimatedEarningsLossNetOnContractsInProgress	943,090pwr_EstimatedEarningsLossNetOnContractsInProgress
Cost and estimated earnings, total	7,715,008pwr_CostsAndEstimatedEarnings	7,095,597pwr_CostsAndEstimatedEarnings
Less - Billings to date	(7,675,674)pwr_BillingsToDate	(7,121,225)pwr_BillingsToDate
Cost and estimated earnings, Net	39,334pwr_CostAndEstimatedEarningsNet	(25,628)pwr_CostAndEstimatedEarningsNet
Costs and estimated earnings in excess of billings on uncompleted contracts	290,447us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	213,478us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Less - Billings in excess of costs and estimated earnings on uncompleted contracts	(251,113)us-gaap_BillingsInExcessOfCost	(239,106)us-gaap_BillingsInExcessOfCost
Cost and estimated earnings, Net	$ 39,334pwr_CostAndEstimatedEarningsNet	$ (25,628)pwr_CostAndEstimatedEarningsNet

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Billings to date.

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Cost and estimated earnings, net.

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Estimated earnings, net of estimated losses on contracts in progress.

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57788-111642



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings which is expected to be collected within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(c)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c(3)

-Article 5

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