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Debt Obligations (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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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

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