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Debt Obligations - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees under the credit facility	$ 328,500,000us-gaap_LettersOfCreditOutstandingAmount
Amount borrowed under the credit facility	106,434,000us-gaap_LineOfCredit	68,793,000us-gaap_LineOfCredit
Credit facility available for revolving loans or issuing new letters of credit	890,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
U S Dollar [Member]
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees under the credit facility	226,300,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CurrencyAxis = currency_USD
Canada and Australia Dollar [Member]
Line of Credit Facility [Line Items]
Letters of credit and bank guarantees under the credit facility	102,200,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CurrencyAxis = pwr_CanadaAndAustraliaDollarMember
Second Amendment [Member]
Line of Credit Facility [Line Items]
Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount	25,000,000pwr_ReductionInCompanyMaximumFundedDebtAndMaximumSeniorDebtByAllCashAndCashEquivalentsInExcessOfAmount / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement	65.00%pwr_PercentageOfCapitalStockOfDirectForeignSubsidiariesRequiredToSecureCreditAgreement / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases	100,000,000pwr_AvailabilityAmountToAllowDividendsAndStockRepurchases / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Cross default provisions with debt instruments exceeding this amount	75,000,000pwr_CrossDefaultProvisions / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Prior and After April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	1,325,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = pwr_PeriodThreeMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Maturity date of senior secured revolving credit facility	Oct. 30, 2018
Option to increase revolving commitments under the credit agreement	300,000,000pwr_OptionToIncreaseRevolvingCommitmentsUnderCreditAgreement / us-gaap_DebtInstrumentAxis = pwr_PeriodThreeMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Prior to April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Commitment fee	0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = pwr_PeriodOneMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Commitment fee	0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Commitment fee	0.40%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Standby Letters of Credit [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_DebtInstrumentAxis = pwr_PeriodOneMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Standby Letters of Credit [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Standby Letters of Credit [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	2.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Performance Letters of Credit [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = pwr_PerformanceLettersOfCreditMember / us-gaap_DebtInstrumentAxis = pwr_PeriodOneMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember
Performance Letters of Credit [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.675%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = pwr_PerformanceLettersOfCreditMember / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Performance Letters of Credit [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.275%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = pwr_PerformanceLettersOfCreditMember / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodOneMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_VariableRateAxis = pwr_ExcessOfEurocurrencyRateApplicableToDomesticBorrowingsOnlyMember
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = pwr_ExcessOfEurocurrencyRateApplicableToDomesticBorrowingsOnlyMember
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	2.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = pwr_ExcessOfEurocurrencyRateApplicableToDomesticBorrowingsOnlyMember
Excess of Base Rate Domestic Borrowings Only [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodOneMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_VariableRateAxis = pwr_ExcessOfBaseRateDomesticBorrowingsOnlyMember
Excess of Base Rate Domestic Borrowings Only [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = pwr_ExcessOfBaseRateDomesticBorrowingsOnlyMember
Excess of Base Rate Domestic Borrowings Only [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = pwr_ExcessOfBaseRateDomesticBorrowingsOnlyMember
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodOneMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_VariableRateAxis = pwr_ExcessOfEuroCurrencyRateOfCreditAgreementForForeignBorrowingsMember
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = pwr_ExcessOfEuroCurrencyRateOfCreditAgreementForForeignBorrowingsMember
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	2.125%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = pwr_PeriodTwoMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = pwr_ExcessOfEuroCurrencyRateOfCreditAgreementForForeignBorrowingsMember
Excess of Federal Funds Rate [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_VariableRateAxis = pwr_ExcessOfFederalFundsRateMember
Excess of Euro Currency Rate [Member] | Second Amendment [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_VariableRateAxis = pwr_ExcessOfEuroCurrencyRateMember
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | U S Dollar [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CurrencyAxis = currency_USD / us-gaap_DebtInstrumentAxis = pwr_PeriodThreeMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_BridgeLoanMember
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Canadian Dollars [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	30,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CurrencyAxis = pwr_CanadianDollarsMember / us-gaap_DebtInstrumentAxis = pwr_PeriodThreeMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_BridgeLoanMember
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Australian Dollars [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	$ 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CurrencyAxis = currency_AUD / us-gaap_DebtInstrumentAxis = pwr_PeriodThreeMember / us-gaap_LongtermDebtTypeAxis = pwr_SecondAmendmentMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_BridgeLoanMember

X

- Definition

Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases.

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cross-default provisions.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Option to increase revolving commitments under credit agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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