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Debt Obligations (Credit Facility - Terms under the Amended and Restated Credit Agreement) - Additional Information (Detail) - Current Credit Agreement [Member] | 3 Months Ended
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Mar. 31, 2017 USD ($)
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 | $ 25,000,000
Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement | 65.00%
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 | $ 100,000,000
Cross default provisions with debt instruments exceeding this amount | $ 100,000,000
Minimum [Member] |
Line of Credit Facility [Line Items] |
Commitment fee | 0.20%
Minimum [Member] | Standby Letters of Credit [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 1.125%
Minimum [Member] | Performance Letters of Credit [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 0.675%
Maximum [Member] |
Line of Credit Facility [Line Items] |
Commitment fee | 0.40%
Maximum [Member] | Standby Letters of Credit [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 2.125%
Maximum [Member] | Performance Letters of Credit [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 1.275%
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Minimum [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 1.125%
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Maximum [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 2.125%
Excess of Base Rate Domestic Borrowings Only [Member] | Minimum [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 0.125%
Excess of Base Rate Domestic Borrowings Only [Member] | Maximum [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 1.125%
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Minimum [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 1.125%
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Maximum [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 2.125%
Excess of Federal Funds Rate [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 0.50%
Excess of Euro Currency Rate [Member] |
Line of Credit Facility [Line Items] |
Debt Instrument Basis Spread On Variable Rate | 1.00%

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- 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

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- Definition Cross-default provisions. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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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Balance Type: | na
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- 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
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Period Type: | duration

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- 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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- Details
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- Details
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