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Subsequent Event (Detail) - Water and Gas Pipeline Infrastructure Contractor - Subsequent Event $ in Millions	Aug. 07, 2018 USD ($)
Subsequent Event [Line Items]
Cost method investment, ownership percentage	30.00%
Cost method investment, original cost	$ 22.2
Cost method investment, deposits paid	$ 3.7

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- Definition

Cost Method Investment, Ownership Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Cost Method Investments, Deposits Paid

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No definition available.

+ Details

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

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- Definition

Original amount of cost-method investments at the acquisition date.

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No definition available.

+ Details

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

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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