XML 51 R40.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Acquisitions (2015 Acquisitions) - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Entity shares
Business Acquisition [Line Items] |  |
Aggregate consideration for acquisitions | $ | $ 42,211 | $ 110,428
Value of Quanta common stock and exchangeable shares issued | $ |  | 10,127
Contingent consideration | $ | $ 15,400 | 1,001
Acquisitions 2015 [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate consideration for acquisitions | $ |  | $ 110,400
Number of shares granted for acquired companies | shares |  | 461,037
Value of Quanta common stock and exchangeable shares issued | $ |  | $ 10,100
Contingent consideration | $ |  | $ 1,000
Number of business acquisitions |  | 11
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 8
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 4
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1
Acquisitions 2015 [Member] | Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 3
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 3
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] | Australia [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions |  | 1

X
- Definition Business Combination Consideration Transferred Or To Be Transferred Cash And Liabilities Incurred + References No definition available. + Details
Name: | pwr_BusinessCombinationConsiderationTransferredOrToBeTransferredCashAndLiabilitiesIncurred
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of shares of equity interests issued or issuable to acquire entity. + 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 (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + 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 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Namespace Prefix: | us-gaap_
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 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 + 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
- Details
Name: | us-gaap_BusinessAcquisitionAxis=pwr_Acquisitions2015Member
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_US
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: |

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