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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 | 12 Months Ended | 84 Months Ended | 144 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2026 | Dec. 31, 2025
Fiber Optic Licensing and Other [Member] | Minimum [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |
License And Collaboration Agreements [Line Items] |  |  |  |  |  |  |
Fixed non-cancelable minimum licensing revenues | $ 32,775 us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 48,950 us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 62,348 us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 74,933 us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 90,549 us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 124,739 us-gaap_Revenues / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | $ 434,294 us-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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