XML 67 R50.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Summary of Significant Accounting Policies (Revenue Recognition) - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,102,966,000 | $ 2,042,186,000 | $ 1,792,430,000 | $ 1,713,737,000 | $ 1,899,272,000 | $ 1,939,438,000 | $ 1,872,340,000 | $ 1,861,386,000 | $ 7,651,319,000 | $ 7,572,436,000 | $ 7,747,229,000
Change orders and/or claims | 137,800,000 |  |  |  | $ 137,200,000 |  |  |  | $ 137,800,000 | $ 137,200,000 |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent change in contract estimates impact on operating results is less than this percentage |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00%
Alaska Power Plant Construction Project [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Losses on Contracts |  |  |  |  |  |  |  |  | $ 54,800,000 | $ 44,900,000 |
Contract value of project | $ 202,000,000 |  |  |  |  |  |  |  | 202,000,000 |  |
Revenue Recognized For Losses Member | Alaska Power Plant Construction Project [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 0 |  |

X
- Definition Represents a contract value. + References No definition available. + Details
Name: | pwr_ContractValueOfProject
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percent change in contract estimates impact on operating results is less than this percentage. + References No definition available. + Details
Name: | pwr_PercentChangeInContractEstimatesImpactOnOperatingResultsIsLessThanThisPercentage
Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenue recognition. + References No definition available. + Details
Name: | pwr_RevenueRecognitionLineItems
Namespace Prefix: | pwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_LossOnContracts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueServicesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49324-109356 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68053980&loc=d3e50000-109363 + Details
Name: | us-gaap_UnapprovedChangeOrdersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=pwr_AlaskaPowerPlantConstructionProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnusualRiskOrUncertaintyByNatureAxis=pwr_RevenueRecognizedForLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |