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Debt Obligations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Line of Credit Facility [Line Items]  
Letters of credit issued under the credit facility $ 240.3
Amount borrowed under the credit facility 0
Credit facility available for revolving loans or issuing new letters of credit 1,080
Prior Credit Facility [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 475.0
Maturity date of senior secured revolving credit facility Sep. 19, 2012
Base rate in excess of Federal Funds Rate 0.50%
Prior Credit Facility [Member] | Minimum [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.15%
Letter of credit fee 0.875%
Interest rate in excess of euro dollar rate 0.875%
Interest rate in excess of base rate 0.00%
Prior Credit Facility [Member] | Maximum [Member]
  
Line of Credit Facility [Line Items]  
Commitment fee 0.35%
Letter of credit fee 1.75%
Interest rate in excess of euro dollar rate 1.75%
Interest rate in excess of base rate 0.75%
United States Dollar [Member]
  
Line of Credit Facility [Line Items]  
Letters of credit issued under the credit facility 184.2
Canada And Australia Dollar [Member]
  
Line of Credit Facility [Line Items]  
Letters of credit issued under the credit facility 56.1
First Amendment [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 700.0
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 25.0
Base rate in excess of Federal Funds Rate 0.50%
One possible rate is this rate in excess of Eurocurrency Rate 1.00%
First Amendment [Member] | Minimum [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 of credit agreement for foreign borrowings 1.25%
First Amendment [Member] | Maximum [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 of credit agreement for foreign borrowings 2.50%
First Amendment [Member] | Performance Letter of Credit [Member] | Minimum [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.75%
First Amendment [Member] | Performance Letter of Credit [Member] | Maximum [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 1.50%
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 25.0
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
Cross default provisions with debt instruments exceeding this amount 75.0
Second Amendment [Member] | Prior to April 1, 2014 [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 1,325.0
Maturity date of senior secured revolving credit facility Oct. 30, 2018
Option to increase revolving commitments under the credit agreement 300.0
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 of credit agreement for foreign borrowings 1.25%
Second Amendment [Member] | Prior to April 1, 2014 [Member] | Performance Letters Of Credit [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.75%
Second Amendment [Member] | Prior to April 1, 2014 [Member] | U S Dollar [Member] | Swing Line Loans [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 50.0
Second Amendment [Member] | Prior to April 1, 2014 [Member] | Canadian Dollars [Member] | Swing Line Loans [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 30.0
Second Amendment [Member] | Prior to April 1, 2014 [Member] | Australian Dollars [Member] | Swing Line Loans [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility 20.0
Second Amendment [Member] | Prior to April 1, 2014 [Member] | Revolving Loans and Letter of Credit in Alternative Currencies [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 400.0
Second Amendment [Member] | Effective April 1, 2014 [Member] | Minimum [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 of credit agreement for foreign borrowings 1.125%
Second Amendment [Member] | Effective April 1, 2014 [Member] | Maximum [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 of credit agreement for foreign borrowings 2.125%
Second Amendment [Member] | Effective April 1, 2014 [Member] | Performance Letters Of Credit [Member] | Minimum [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.675%
Second Amendment [Member] | Effective April 1, 2014 [Member] | Performance Letters Of Credit [Member] | Maximum [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 1.275%