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Debt Obligations - Additional Information (Detail) (USD $)
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6 Months Ended | 10 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
U S Dollar [Member]
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Jun. 30, 2014
Canada And Australia Dollar [Member]
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Jun. 30, 2014
Second Amendment [Member]
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Oct. 30, 2013
First Amendment [Member]
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Oct. 30, 2013
Minimum [Member]
First Amendment [Member]
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Oct. 30, 2013
Maximum [Member]
First Amendment [Member]
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Jun. 30, 2014
Prior and After April 1, 2014 [Member]
Second Amendment [Member]
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Jun. 30, 2014
Prior to April 1, 2014 [Member]
Second Amendment [Member]
|
Jun. 30, 2014
Prior to April 1, 2014 [Member]
Performance Letters Of Credit [Member]
Second Amendment [Member]
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Jun. 30, 2014
Effective April 1, 2014 [Member]
Minimum [Member]
Second Amendment [Member]
|
Jun. 30, 2014
Effective April 1, 2014 [Member]
Maximum [Member]
Second Amendment [Member]
|
Jun. 30, 2014
Effective April 1, 2014 [Member]
Performance Letters Of Credit [Member]
Minimum [Member]
Second Amendment [Member]
|
Jun. 30, 2014
Effective April 1, 2014 [Member]
Performance Letters Of Credit [Member]
Maximum [Member]
Second Amendment [Member]
|
Jun. 30, 2014
Swing Line Loans [Member]
Prior and After April 1, 2014 [Member]
Second Amendment [Member]
U S Dollar [Member]
|
Jun. 30, 2014
Swing Line Loans [Member]
Prior and After April 1, 2014 [Member]
Second Amendment [Member]
Canadian Dollars [Member]
|
Jun. 30, 2014
Swing Line Loans [Member]
Prior and After April 1, 2014 [Member]
Second Amendment [Member]
Australian Dollars [Member]
|
Jun. 30, 2014
Revolving Loans and Letter of Credit in Alternative Currencies [Member]
Prior and After April 1, 2014 [Member]
Second Amendment [Member]
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Oct. 30, 2013
Performance Letter of Credit [Member]
Minimum [Member]
First Amendment [Member]
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Oct. 30, 2013
Performance Letter of Credit [Member]
Maximum [Member]
First Amendment [Member]
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| Line of Credit Facility [Line Items] | |||||||||||||||||||||
| Senior secured revolving credit facility | $ 700,000,000 | $ 1,325,000,000 | $ 50,000,000 | $ 30,000,000 | $ 20,000,000 | $ 400,000,000 | |||||||||||||||
| Maturity date of senior secured revolving credit facility | Aug. 02, 2016 | Oct. 30, 2018 | |||||||||||||||||||
| Option to increase revolving commitments under the credit agreement | 300,000,000 | ||||||||||||||||||||
| Letters of credit issued under the credit facility | 243,800,000 | 215,500,000 | 28,300,000 | ||||||||||||||||||
| Amount borrowed under the credit facility | 0 | 0 | |||||||||||||||||||
| Credit facility available for revolving loans or issuing new letters of credit | 1,080,000,000 | ||||||||||||||||||||
| Commitment fee | 0.20% | 0.45% | 0.20% | 0.20% | 0.40% | ||||||||||||||||
| Letter of credit fee | 1.25% | 2.50% | 1.25% | 0.75% | 1.125% | 2.125% | 0.675% | 1.275% | 0.75% | 1.50% | |||||||||||
| Interest rate in excess of Eurocurrency rate applicable to domestic borrowings only | 1.25% | 2.50% | 1.25% | 1.125% | 2.125% | ||||||||||||||||
| Interest rate in excess of base rate, domestic borrowings only | 0.25% | 1.50% | 0.25% | 0.125% | 1.125% | ||||||||||||||||
| Interest rate in excess of Eurocurrency rate of credit agreement for foreign borrowings | 1.25% | 2.50% | 1.25% | 1.125% | 2.125% | ||||||||||||||||
| Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount | 25,000,000 | 25,000,000 | |||||||||||||||||||
| Base rate in excess of Federal Funds Rate | 0.50% | 0.50% | |||||||||||||||||||
| One possible rate is this rate in excess of Eurocurrency Rate | 1.00% | 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 | 100,000,000 | ||||||||||||||||||||
| Cross default provisions with debt instruments exceeding this amount | $ 75,000,000 | ||||||||||||||||||||