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Debt Obligations - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Line of Credit Facility [Line Items]  
Letters of credit issued under the credit facility $ 213,500,000
Amount borrowed under the credit facility 0
Credit facility available for revolving loans or issuing new letters of credit 1,110,000,000
U S Dollar [Member]
  
Line of Credit Facility [Line Items]  
Letters of credit issued under the credit facility 186,700,000
Canada And Australia Dollar [Member]
  
Line of Credit Facility [Line Items]  
Letters of credit issued under the credit facility 26,800,000
Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
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%
One possible rate is this rate in excess of Eurocurrency Rate 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
First Amendment [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 700,000,000
Maturity date of senior secured revolving credit facility Aug. 02, 2016
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%
One possible rate is this rate in excess of Eurocurrency Rate 1.00%
Minimum [Member] | First Amendment [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.20%
Letter of credit fee 1.25%
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only 1.25%
Interest rate in excess of base rate, domestic borrowings only 0.25%
Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings 1.25%
Maximum [Member] | First Amendment [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.45%
Letter of credit fee 2.50%
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only 2.50%
Interest rate in excess of base rate, domestic borrowings only 1.50%
Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings 2.50%
Prior to April 1, 2014 [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.20%
Letter of credit fee 1.25%
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only 1.25%
Interest rate in excess of base rate, domestic borrowings only 0.25%
Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings 1.25%
Prior to April 1, 2014 [Member] | Performance Letters Of Credit [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.75%
Effective April 1, 2014 [Member] | Minimum [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.20%
Letter of credit fee 1.125%
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only 1.125%
Interest rate in excess of base rate, domestic borrowings only 0.125%
Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings 1.125%
Effective April 1, 2014 [Member] | Maximum [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.40%
Letter of credit fee 2.125%
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only 2.125%
Interest rate in excess of base rate, domestic borrowings only 1.125%
Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings 2.125%
Effective April 1, 2014 [Member] | Performance Letters Of Credit [Member] | Minimum [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.675%
Effective April 1, 2014 [Member] | Performance Letters Of Credit [Member] | Maximum [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 1.275%
Prior and After April 1, 2014 [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 1,325,000,000
Maturity date of senior secured revolving credit facility Oct. 30, 2018
Option to increase revolving commitments under the credit agreement 300,000,000
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | U S Dollar [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 50,000,000
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Canadian Dollars [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 30,000,000
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Australian Dollars [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 20,000,000
Performance Letter of Credit [Member] | Minimum [Member] | First Amendment [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.75%
Performance Letter of Credit [Member] | Maximum [Member] | First Amendment [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 1.50%
Revolving Loans and Letter of Credit in Alternative Currencies [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 400,000,000