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Debt Obligations - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2010 | May 14, 2010 | Dec. 31, 2010 3.75% Convertible Subordinated Notes [Member] | Sep. 30, 2011 Prior Credit Facility [Member] | Dec. 31, 2011 Prior Credit Facility [Member] | Aug. 02, 2011 Prior Credit Facility [Member] | Dec. 31, 2012 Revolving Loans and Letter of Credit in Alternative Currencies [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2011 Minimum [Member] | May 14, 2010 Minimum [Member] 3.75% Convertible Subordinated Notes [Member] | Dec. 31, 2012 Minimum [Member] Performance Letter Of Credit [Member] | Dec. 31, 2011 Minimum [Member] Prior Credit Facility [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2011 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Performance Letter Of Credit [Member] | Dec. 31, 2011 Maximum [Member] Prior Credit Facility [Member]
Line Of Credit Facility Covenant Compliance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility | $ 700,000,000 |  |  |  |  |  | $ 475,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |  |
Maturity date of senior secured revolving credit facility | Aug. 02, 2016 |  |  |  | Sep. 19, 2012 |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued under the credit facility | 183,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed under the credit facility | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available for revolving loans or issuing new letters of credit | 516,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only, plus Mandatory Cost |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  | 2.50% |  |  |
Interest rate in excess of Base Rate, domestic borrowings only |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  | 1.50% |  |  |
Interest rate of credit agreement for foreign borrowings, plus mandatory costs |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  | 2.50% |  |  |
Letter of credit fee |  |  |  |  |  |  |  |  | 1.25% |  |  | 0.75% | 0.875% | 2.50% |  | 1.50% | 1.75%
Commitment fee |  |  |  |  |  |  |  |  | 0.20% |  |  |  | 0.15% | 0.45% |  |  | 0.35%
Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate in excess of Federal Funds Rate | 0.50% |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
One possible rate is this rate in excess of the Eurocurrency Rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross default provisions with debt instruments exceeding this amount | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate in excess of Base Rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  | 0.75%
Interest rate in excess of Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  | 0.875% |  |  |  | 1.75%
Debt Instrument, Face Amount |  |  | 143,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price as a percentage of the principle amount of the 3.75% convertible subordinated notes |  |  | 101.607% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of aggregate Redemption Price |  | 146,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt, net |  | (7,107,000) |  | (7,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Non cash gain (loss) included in loss on extinguishment of debt |  |  |  | (3,500,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption premium on convertible subordinated notes |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash gain (loss) from the write-off of financing costs |  |  |  | $ (1,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption premium for payment of aggregate redemption price |  |  |  | 1.607% |  |  |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 3.75% |  |  | 8.00% | 8.00% |  |

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