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Debt Obligations - Additional Information (Detail) (USD $) |  |  |  | 6 Months Ended | 10 Months Ended | 6 Months Ended |  | 6 Months Ended |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 U S Dollar [Member] | Jun. 30, 2014 Canada And Australia Dollar [Member] | Jun. 30, 2014 Second Amendment [Member] | Oct. 30, 2013 First Amendment [Member] | Oct. 30, 2013 Minimum [Member] First Amendment [Member] | Oct. 30, 2013 Maximum [Member] First Amendment [Member] | Jun. 30, 2014 Prior and After April 1, 2014 [Member] Second Amendment [Member] | Jun. 30, 2014 Prior to April 1, 2014 [Member] Second Amendment [Member] | Jun. 30, 2014 Prior to April 1, 2014 [Member] Performance Letters Of Credit [Member] Second Amendment [Member] | Jun. 30, 2014 Effective April 1, 2014 [Member] Minimum [Member] Second Amendment [Member] | Jun. 30, 2014 Effective April 1, 2014 [Member] Maximum [Member] Second Amendment [Member] | Jun. 30, 2014 Effective April 1, 2014 [Member] Performance Letters Of Credit [Member] Minimum [Member] Second Amendment [Member] | Jun. 30, 2014 Effective April 1, 2014 [Member] Performance Letters Of Credit [Member] Maximum [Member] Second Amendment [Member] | Jun. 30, 2014 Swing Line Loans [Member] Prior and After April 1, 2014 [Member] Second Amendment [Member] U S Dollar [Member] | Jun. 30, 2014 Swing Line Loans [Member] Prior and After April 1, 2014 [Member] Second Amendment [Member] Canadian Dollars [Member] | Jun. 30, 2014 Swing Line Loans [Member] Prior and After April 1, 2014 [Member] Second Amendment [Member] Australian Dollars [Member] | Jun. 30, 2014 Revolving Loans and Letter of Credit in Alternative Currencies [Member] Prior and After April 1, 2014 [Member] Second Amendment [Member] | Oct. 30, 2013 Performance Letter of Credit [Member] Minimum [Member] First Amendment [Member] | Oct. 30, 2013 Performance Letter of Credit [Member] Maximum [Member] First Amendment [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured revolving credit facility |  |  |  |  |  | $ 700,000,000 |  |  | $ 1,325,000,000 |  |  |  |  |  |  | $ 50,000,000 | $ 30,000,000 | $ 20,000,000 | $ 400,000,000 |  |
Maturity date of senior secured revolving credit facility |  |  |  |  |  | Aug. 02, 2016 |  |  | Oct. 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Option to increase revolving commitments under the credit agreement |  |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued under the credit facility | 243,800,000 |  | 215,500,000 | 28,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed under the credit facility | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility available for revolving loans or issuing new letters of credit | 1,080,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  | 0.20% | 0.45% |  | 0.20% |  | 0.20% | 0.40% |  |  |  |  |  |  |  |
Letter of credit fee |  |  |  |  |  |  | 1.25% | 2.50% |  | 1.25% | 0.75% | 1.125% | 2.125% | 0.675% | 1.275% |  |  |  |  | 0.75% | 1.50%
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only |  |  |  |  |  |  | 1.25% | 2.50% |  | 1.25% |  | 1.125% | 2.125% |  |  |  |  |  |  |  |
Interest rate in excess of base rate, domestic borrowings only |  |  |  |  |  |  | 0.25% | 1.50% |  | 0.25% |  | 0.125% | 1.125% |  |  |  |  |  |  |  |
Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings |  |  |  |  |  |  | 1.25% | 2.50% |  | 1.25% |  | 1.125% | 2.125% |  |  |  |  |  |  |  |
Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount |  |  |  |  | 25,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate in excess of Federal Funds Rate |  |  |  |  | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One possible rate is this rate in excess of Eurocurrency Rate |  |  |  |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross default provisions with debt instruments exceeding this amount |  |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of availability under the credit agreement and/or cash and cash equivalents on hand that must be present to allow for cash payments of dividends and stock repurchases. + References No definition available. + Details
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- Definition Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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