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Summary of Significant Accounting Policies - Minimum Future Licensing Revenue (Detail) (Fiber Optic Licensing and Other [Member], Minimum [Member], Scenario Forecast [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended				84 Months Ended	141 Months Ended
	Dec. 31, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2025	Dec. 31, 2026
Fiber Optic Licensing and Other [Member] | Minimum [Member] | Scenario Forecast [Member]
License And Collaboration Agreements [Line Items]
Fixed non-cancelable minimum licensing revenues	$ 71,066us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	$ 37,457us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	$ 53,683us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	$ 67,458us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	$ 80,384us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	$ 443,165us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	$ 133,117us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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