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Debt Obligations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Oct. 30, 2013
Subsequent Event [Member]
Sep. 30, 2013
Revolving Loans and Letter of Credit in Alternative Currencies [Member]
Sep. 30, 2013
Minimum [Member]
Sep. 30, 2013
Minimum [Member]
Performance Letter of Credit [Member]
Sep. 30, 2013
Maximum [Member]
Sep. 30, 2013
Maximum [Member]
Performance Letter of Credit [Member]
Line of Credit Facility [Line Items]              
Senior secured revolving credit facility $ 700.0 $ 1,325.0 $ 100.0        
Maturity date of senior secured revolving credit facility Aug. 02, 2016 Oct. 30, 2018          
Letters of credit issued under the credit facility 226.4            
Amount borrowed under the credit facility 0            
Credit facility available for revolving loans or issuing new letters of credit 473.6            
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% 2.50% 1.50%
Commitment fee       0.20%   0.45%  
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