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Debt Obligations (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 700.0
Maturity date of senior secured revolving credit facility Aug. 02, 2016
Letters of credit issued under the credit facility 179.3
Amount borrowed under the credit facility 125.0
Credit facility available for revolving loans or issuing new letters of credit 395.7
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 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 30.0
Minimum [Member]
  
Line of Credit Facility [Line Items]  
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only, plus Mandatory Cost 1.25%
Interest rate in excess of Base Rate, domestic borrowings only 0.25%
Interest rate of credit agreement for foreign borrowings, plus mandatory costs 1.25%
Letter of credit fee 1.25%
Commitment fee 0.20%
Maximum [Member]
  
Line of Credit Facility [Line Items]  
Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only, plus Mandatory Cost 2.50%
Interest rate in excess of Base Rate, domestic borrowings only 1.50%
Interest rate of credit agreement for foreign borrowings, plus mandatory costs 2.50%
Letter of credit fee 2.50%
Commitment fee 0.45%
Performance Letter Of Credit [Member] | Minimum [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.75%
Performance Letter Of Credit [Member] | Maximum [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 1.50%
Revolving Loans And Letter Of Credit In Alternative Currencies [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 100.0