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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014, 2013 and 2012:
|  | Operating Units Providing Predominantly Electric Power and Oil and Gas Infrastructure Services |  | Operating Unit Providing Fiber Optic Licensing
|  | 2014 |  | 2013 |  | 2012 |  | 2014 |  | 2013 |  | 2012
Years of cash flows before terminal value |  | 5 |  | 5 |  | 5 |  | 15 |  | 15 |  | 15
Discount rates |  | 12% to 14% |  | 12% to 14% |  | 12% to 13% |  | 12% |  | 12% |  | 12%
EBITDA multiples |  | 5.0 to 6.0 |  | 5.0 to 8.0 |  | 4.5 to 8.0 |  | 9.5 |  | 9.5 |  | 9.5
Weighting of three approaches: |  |  |  |  |  |  |  |  |  |  |  |
Discounted cash flows |  | 70% |  | 70% |  | 70% |  | 90% |  | 90% |  | 90%
Market multiple |  | 15% |  | 15% |  | 15% |  | 5% |  | 5% |  | 5%
Market capitalization |  | 15% |  | 15% |  | 15% |  | 5% |  | 5% |  | 5%
Minimum Future Licensing Revenue | Minimum future licensing revenues expected to be recognized by Quanta pursuant to these agreements at December 31, 2014 were as follows (in thousands):
|  | Minimum Future Licensing Revenues |
Year Ending December 31 — |  |  |  |
2015 |  | $ | 90,549 |
2016 |  |  | 74,933 |
2017 |  |  | 62,348 |
2018 |  |  | 48,950 |
2019 |  |  | 32,775 |
Thereafter |  |  | 124,739 |
Fixed non-cancelable minimum licensing revenues |  | $ | 434,294 |

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