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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 Electric Power Division [Member] | Sep. 30, 2014 Oil and Gas Infrastructure Division [Member] | Sep. 30, 2014 Fiber Optic Licensing Division[Member] | Dec. 31, 2013 Fiber Optic Licensing Division[Member]
Goodwill [Line Items] |  |  |  |  |
Goodwill, beginning balance | $ 1,780,717 | $ 1,168,084 | $ 277,843 | $ 334,790 | $ 334,790
Goodwill acquired | 109,072 | 71,517 | 37,555 |  |
Foreign currency translation adjustment related to goodwill | (9,699) | (8,228) | (1,471) |  |
Goodwill, ending balance | $ 1,880,090 | $ 1,231,373 | $ 313,927 | $ 334,790 | $ 334,790

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