XML 70 R38.htm IDEA: XBRL DOCUMENT v3.3.0.814

Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, beginning balance		$ 1,596,695
Goodwill acquired	$ 56,300	49,554
Purchase price allocation adjustments		(8,113)
Foreign currency translation adjustments		(41,205)
Goodwill, ending balance	1,596,695	1,596,931	$ 1,596,695
Electric Power Division [Member]
Goodwill [Line Items]
Goodwill, beginning balance		1,223,224
Goodwill acquired		27,197	72,300
Purchase price allocation adjustments		750
Foreign currency translation adjustments		(23,811)
Goodwill, ending balance	1,223,224	1,227,360	1,223,224
Oil and Gas Infrastructure Division [Member]
Goodwill [Line Items]
Goodwill, beginning balance		373,471
Goodwill acquired		22,357	94,100
Purchase price allocation adjustments		(8,863)
Foreign currency translation adjustments		(17,394)
Goodwill, ending balance	$ 373,471	$ 369,571	$ 373,471

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 10



-Section 25



-Paragraph 16



-URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (g)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillPurchaseAccountingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (f)



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillTranslationAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pwr_ElectricPowerDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pwr_OilAndGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: