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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units | The following table presents the significant estimates used by management in determining the fair values of Quanta’s reporting units at December 31, 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015
Years of cash flows before terminal value |  | 5 years |  | 5 years |  | 5 years
Discount rates |  | 12.0% to 14.0% |  | 12.5% to 14.5% |  | 12.0% to 16.0%
EBITDA multiples |  | 5.5 to 7.0 |  | 5.5 to 7.0 |  | 5.0 to 6.5
Weighting of three approaches: |  |  |  |  |  |
Discounted cash flows |  | 70% |  | 70% |  | 70%
Market multiple |  | 15% |  | 15% |  | 15%
Market capitalization |  | 15% |  | 15% |  | 15%
Fair Value Measurement Inputs for Acquisition | The following table presents the significant estimates used by management in determining the fair values of customer relationships associated with acquisitions in the years ended December 31, 2017, 2016 and 2015:
|  | 2017 |  | 2016 |  | 2015
Discount rates |  | 17% to 25% |  | 20% to 23% |  | 18% to 22%
Customer attrition rates |  | 15% to 78% |  | 10% to 70% |  | 14% to 70%

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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