Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Additional Information (Detail)

v2.4.0.8
Debt Obligations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
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 179.2
Amount borrowed under the credit facility 0
Credit facility available for revolving loans or issuing new letters of credit 520.8
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
Revolving Loans and Letter of Credit in Alternative Currencies [Member]
  
Line of Credit Facility [Line Items]  
Senior secured revolving credit facility $ 100.0
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%
Minimum [Member] | Performance Letter of Credit [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 0.75%
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%
Maximum [Member] | Performance Letter of Credit [Member]
  
Line of Credit Facility [Line Items]  
Letter of credit fee 1.50%