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Acquisitions - Additional Information (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) Entity shares | Dec. 31, 2014 USD ($) Entity shares | Dec. 31, 2013 USD ($) Entity shares
Business Acquisition [Line Items] |  |  |
Aggregate consideration for acquisitions | $ 110,428 | $ 279,533 | $ 341,100
Value of Quanta common stock and exchangeable shares issued | 10,127 | $ 134,500 | $ 88,900
Contingent consideration | $ 1,001 |  |
Number of business acquisitions | Entity | 11 | 9 | 6
Goodwill acquired | $ 51,860 | $ 174,485 |
Fair value of accounts receivable acquired | 20,600 | 117,200 |
Goodwill expected to be deductible for income tax | 33,900 | 43,500 |
Income (loss) from continuing operations before income taxes | 228,675 | 426,599 | $ 588,320
2015 Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net tangible assets acquired | 44,700 |  |
Goodwill acquired | 51,860 |  |
Other intangible assets, acquired | 25,000 |  |
Revenues | 104,600 | 314,100 | 251,300
Income (loss) from continuing operations before income taxes | 300 | 3,400 | $ 18,200
Acquisition costs | $ 3,600 | $ 11,600 |
Common Stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of shares granted for acquired companies | shares | 461,037 | 686,382 | 3,547,482
Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of shares granted for acquired companies | shares |  | 3,825,971 |
Series G Preferred Stock [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of shares granted for acquired companies | shares |  | 1 |
Series G Preferred Stock [Member] | Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of shares granted for acquired companies | shares |  | 899,858 |
Electric Power Infrastructure Services Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 8 |  |
Electric Power Infrastructure Services Business [Member] | United States [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 4 | 1 |
Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 1 | 1 |
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 3 | 4 |
Oil and Gas Infrastructure Services Business [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 3 |  |
Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 1 | 1 |
Oil and Gas Infrastructure Services Business [Member] | Australia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 1 |  |
Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of business acquisitions | Entity | 1 | 2 |
Electric Power Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | $ 31,224 | $ 71,517 | $ 112,500
Oil and Gas Infrastructure Division [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill acquired | $ 20,636 | $ 102,968 | $ 143,300

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