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Commitments and Contingencies - Letters of Credit (Detail) $ in Millions	Mar. 31, 2018 USD ($)
Letters Of Credit and Bank Guarantees
Loss Contingencies [Line Items]
Letters of credit and bank guarantees	$ 446.8

X

- Definition

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

+ References

No definition available.

+ Details

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

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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=pwr_LettersOfCreditAndBankGuaranteesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: