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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)

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