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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016, 2015 and 2014:
|  | 2016 |  | 2015 |  | 2014
Years of cash flows before terminal value |  | 5 |  | 5 |  | 5
Discount rates |  | 12.5% to 14.5% |  | 12.0% to 16.0% |  | 12.0% to 14.0%
EBITDA multiples |  | 5.5 to 7.0 |  | 5.0 to 6.5 |  | 5.0 to 6.0
Weighting of three approaches: |  |  |  |  |  |
Discounted cash flows |  | 70% |  | 70% |  | 70%
Market multiple |  | 15% |  | 15% |  | 15%
Market capitalization |  | 15% |  | 15% |  | 15%

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