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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
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Balance Sheet Related Disclosures [Abstract] |  |
Costs incurred on contracts in progress | $ 6,603,351 pwr_CostsIncurredOnContractsInProgress | $ 6,152,507 pwr_CostsIncurredOnContractsInProgress
Estimated earnings, net of estimated losses | 1,111,657 pwr_EstimatedEarningsLossNetOnContractsInProgress | 943,090 pwr_EstimatedEarningsLossNetOnContractsInProgress
Cost and estimated earnings, total | 7,715,008 pwr_CostsAndEstimatedEarnings | 7,095,597 pwr_CostsAndEstimatedEarnings
Less - Billings to date | (7,675,674)pwr_BillingsToDate | (7,121,225)pwr_BillingsToDate
Cost and estimated earnings, Net | 39,334 pwr_CostAndEstimatedEarningsNet | (25,628)pwr_CostAndEstimatedEarningsNet
Costs and estimated earnings in excess of billings on uncompleted contracts | 290,447 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear | 213,478 us-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 | $ 39,334 pwr_CostAndEstimatedEarningsNet | $ (25,628)pwr_CostAndEstimatedEarningsNet

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- Definition 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 + Details
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- Definition 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 + Details
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