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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Changes in Quanta's Goodwill | A summary of changes in Quanta’s goodwill is as follows (in thousands):
|  | Electric Power Infrastructure Services Division |  |  | Oil and Gas Infrastructure Services Division |  |  | Total |
Goodwill balance at December 31, 2013 |  | $ | 1,168,084 |  |  | $ | 277,843 |  |  | $ | 1,445,927 |
Goodwill acquired during 2014 |  |  | 71,517 |  |  |  | 102,968 |  |  |  | 174,485 |
Foreign currency translation adjustments |  |  | (16,377 | ) |  |  | (7,340 | ) |  |  | (23,717 | )
Goodwill balance at December 31, 2014 |  |  | 1,223,224 |  |  |  | 373,471 |  |  |  | 1,596,695 |
Goodwill acquired during 2015 |  |  | 31,224 |  |  |  | 20,636 |  |  |  | 51,860 |
Purchase price allocation adjustments |  |  | 750 |  |  |  | (8,867 | ) |  |  | (8,117 | )
Goodwill impaired during 2015 |  |  | — |  |  |  | (39,826 | ) |  |  | (39,826 | )
Foreign currency translation adjustments |  |  | (28,953 | ) |  |  | (19,001 | ) |  |  | (47,954 | )
Balance at December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 1,226,245 |  |  | $ | 366,306 |  |  | $ | 1,592,551 |
Accumulated impairment |  |  | — |  |  |  | (39,893 | ) |  |  | (39,893 | )
|  | $ | 1,226,245 |  |  | $ | 326,413 |  |  | $ | 1,552,658 |
Other Intangible Assets | Quanta’s intangible assets subject to amortization and the remaining weighted average amortization periods related to such assets were as follows (in thousands except for weighted average amortization periods, which are in years):
|  | As of December 31, 2015 |  |  | As of December 31, 2014 |  |  | As of December 31, 2015 |
|  | Intangible Assets |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |  |  | Intangible Assets |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |  |  | Remaining Weighted Average Amortization Period in Years |
Customer relationships |  | $ | 236,731 |  |  | $ | (90,840 | ) |  | $ | 145,891 |  |  | $ | 235,851 |  |  | $ | (63,764 | ) |  | $ | 172,087 |  |  |  | 9.7 |
Backlog |  |  | 130,818 |  |  |  | (126,954 | ) |  |  | 3,864 |  |  |  | 133,704 |  |  |  | (122,265 | ) |  |  | 11,439 |  |  |  | 0.7 |
Trade names |  |  | 51,192 |  |  |  | (9,525 | ) |  |  | 41,667 |  |  |  | 49,664 |  |  |  | (6,278 | ) |  |  | 43,386 |  |  |  | 18.6 |
Non-compete agreements |  |  | 28,560 |  |  |  | (23,507 | ) |  |  | 5,053 |  |  |  | 27,659 |  |  |  | (21,365 | ) |  |  | 6,294 |  |  |  | 3.5 |
Patented rights and developed technology |  |  | 22,447 |  |  |  | (13,848 | ) |  |  | 8,599 |  |  |  | 22,073 |  |  |  | (11,695 | ) |  |  | 10,378 |  |  |  | 4.0 |
Total intangible assets subject to amortization |  | $ | 469,748 |  |  | $ | (264,674 | ) |  | $ | 205,074 |  |  | $ | 468,951 |  |  | $ | (225,367 | ) |  | $ | 243,584 |  |  |  | 10.9 |
Estimated Future Aggregate Amortization Expense of Intangible Assets | The estimated future aggregate amortization expense of intangible assets subject to amortization as of December 31, 2015 is set forth below (in thousands):
For the Fiscal Year Ending December 31, |  |  |
2016 |  | $ | 28,172 |
2017 |  |  | 22,758 |
2018 |  |  | 22,015 |
2019 |  |  | 21,219 |
2020 |  |  | 20,103 |
Thereafter |  |  | 90,807 |
Total |  | $ | 205,074 |

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