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Subsequent Events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	12. SUBSEQUENT EVENTS: Acquisition During the second quarter of 2014, Quanta completed the acquisition of a company that offers geotechnical and geological engineering services for the power transmission, mining, transportation, and water resources sectors in the U.S., Canada and select international markets. The consideration paid for this acquisition consisted of approximately $3.3 million in cash and will include shares of Quanta common stock valued at approximately $2.0 million as of the final determination date, which will be at the end of May 2014. As this transaction was effective during the second quarter of 2014, the results will be included in Quanta’s consolidated financial statements beginning on the date of acquisition. This acquisition should enable Quanta to further enhance its electric power infrastructure service offerings in the U.S., Canada and select international markets.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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