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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Value of Quanta common stock and exchangeable shares issued | $ 10,127 | $ 134,500 | $ 88,900
Cash paid or payable | 110,428 | 279,533 | 341,100
Contingent consideration | 1,001 |  |
Goodwill | 1,552,658 | 1,596,695 | $ 1,445,927
All Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Value of Quanta common stock and exchangeable shares issued | 10,127 | 134,538 |
Cash paid or payable | 110,428 | 279,533 |
Contingent consideration | 1,001 |  |
Fair value of total consideration transferred or estimated to be transferred | 121,556 | 414,071 |
Current assets | 35,188 | 172,121 |
Property and equipment | 44,140 | 159,186 |
Other assets | 4 | 3,501 |
Identifiable intangible assets | 24,987 | 96,302 |
Current liabilities | (24,633) | (145,646) |
Deferred tax liabilities, net | (5,131) | (32,856) |
Other long-term liabilities | (5,606) | (4,926) |
Non-controlling interests | 747 |  |
Total identifiable net assets | 69,696 | 247,682 |
Goodwill | 51,860 | 166,389 |
Fair value of total consideration transferred | $ 121,556 | $ 414,071 |

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