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Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015 Entity	Dec. 31, 2014 Entity	Jun. 30, 2015 Entity	Apr. 29, 2015
Subsequent Event [Line Items]
Number of business acquisitions	3us-gaap_NumberOfBusinessesAcquired	9us-gaap_NumberOfBusinessesAcquired
Cash paid for acquisitions	$ 36,900,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred	$ 284,300,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred
Subsequent Event [Member]
Subsequent Event [Line Items]
Sales price of fiber optic licensing operations				1,000,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Scenario Forecast [Member]
Subsequent Event [Line Items]
Number of business acquisitions			2us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Cash paid for acquisitions			$ 25,400,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

X

- Definition

Aggregate business acquisition consideration of acquired entity cash paid and liabilities incurred during period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
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- Details

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- Details

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- Details

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