Quanta Services, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Discontinued Operations - Additional Information (Detail)

Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012
Discontinued Operations [Line Items]
Cash sale of Quanta's telecommunications subsidiaries		$ 265,000,000
Pre tax gain in discontinued operations		17,962,000
Incremental expense related to accelerated vesting	3,700,000
Telecommunications [Member]
Discontinued Operations [Line Items]
Cash sale of Quanta's telecommunications subsidiaries		265,000,000
Pre tax gain in discontinued operations		18,000,000
Tax amount from gain loss of disposal of discontinued operations		(32,200,000)
Loss on sale, Net of tax		$ (14,200,000)

- Definition

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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- Definition

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

+ References + Details

- Definition

Tax benefit from provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include a tax on the (gain) for the recognition of a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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