XML 93 R81.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Subsequent Events - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Acquisition | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Subsequent Event [Line Items] |  |  |
Consideration transferred or to be transferred cash and liabilities incurred except for contingent consideration |  | $ 42,211,000 | $ 110,428,000
Contingent consideration |  | $ 15,400,000 | $ 1,001,000
Scenario Forecast [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Consideration transferred or to be transferred cash and liabilities incurred except for contingent consideration | $ 34,300,000 |  |
Scenario Forecast [Member] | Maximum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Contingent consideration | $ 4,500,000 |  |
Scenario Forecast [Member] | Electric Power Infrastructure Services Business [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of business acquisitions | Acquisition | 2 |  |
Scenario Forecast [Member] | Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of business acquisitions | Acquisition | 1 |  |
Scenario Forecast [Member] | Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of business acquisitions | Acquisition | 1 |  |

X
- Definition Consideration transferred or to be transferred cash and liabilities incurred except for contingent consideration. + References No definition available. + Details
Name: | pwr_BusinessCombinationConsiderationTransferredOrToBeTransferredCashAndLiabilitiesIncurred
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: 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 3: 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 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pwr_ElectricPowerInfrastructureServicesBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_AU
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |