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Debt Obligations - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2013 | Oct. 30, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | $ 307,000,000 |
Amount borrowed under the credit facility |  |  | 466,850,000 | $ 68,793,000
Credit facility available for revolving loans or issuing new letters of credit |  |  | 1,040,000,000 |
Letters Of Credit and Bank Guarantees [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 307,000,000 |
Letters Of Credit and Bank Guarantees [Member] | U S Dollar [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 220,000,000 |
Letters Of Credit and Bank Guarantees [Member] | Canadian and Australian dollars [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 87,000,000 |
Borrowings Under Credit Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | 466,850,000 |
Borrowings Under Credit Facility [Member] | U S Dollar [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | 400,000,000 |
Borrowings Under Credit Facility [Member] | Canadian Dollars [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | 66,900,000 |
Second Amendment [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount |  |  | $ 25,000,000 |
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 |  |  | $ 100,000,000 |
Second Amendment [Member] | Excess of Federal Funds Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 0.50% |
Second Amendment [Member] | Excess of Euro Currency Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.00% |
First Amendment [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior secured revolving credit facility |  | $ 700,000,000 |  |
Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount | $ 25,000,000 |  |  |
First Amendment [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee |  | 0.20% |  |
First Amendment [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee |  | 0.45% |  |
First Amendment [Member] | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 1.25% |  |
First Amendment [Member] | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 2.50% |  |
First Amendment [Member] | Excess of Base Rate Domestic Borrowings Only [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 0.25% |  |
First Amendment [Member] | Excess of Base Rate Domestic Borrowings Only [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 1.50% |  |
First Amendment [Member] | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 1.25% |  |
First Amendment [Member] | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 2.50% |  |
First Amendment [Member] | Excess of Federal Funds Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate | 0.50% |  |  |
First Amendment [Member] | Excess of Euro Currency Rate [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate | 1.00% |  |  |
First Amendment [Member] | Standby Letters of Credit [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 1.25% |  |
First Amendment [Member] | Standby Letters of Credit [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 2.50% |  |
First Amendment [Member] | Performance Letters of Credit [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 0.75% |  |
First Amendment [Member] | Performance Letters of Credit [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  | 1.50% |  |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee |  |  | 0.20% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee |  |  | 0.40% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 2.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Excess of Base Rate Domestic Borrowings Only [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 0.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Excess of Base Rate Domestic Borrowings Only [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 2.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Standby Letters of Credit [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Standby Letters of Credit [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 2.125% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Performance Letters of Credit [Member] | Minimum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 0.675% |
Effective April 1, 2014 [Member] | Second Amendment [Member] | Performance Letters of Credit [Member] | Maximum [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.275% |
Prior and After April 1, 2014 [Member] | Second Amendment [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior secured revolving credit facility |  |  | $ 1,810,000,000 |
Maturity date of senior secured revolving credit facility |  |  | Dec. 18, 2020 |
Option to increase revolving commitments under the credit agreement |  |  | $ 400,000,000 |
Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Revolving Loans and Letter of Credit in Alternative Currencies [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior secured revolving credit facility |  |  | 600,000,000 |
Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Swing Lines Loan [Member] | U S Dollar [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior secured revolving credit facility |  |  | 100,000,000 |
Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Swing Lines Loan [Member] | Canadian Dollars [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior secured revolving credit facility |  |  | 50,000,000 |
Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Swing Lines Loan [Member] | Australian Dollars [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Senior secured revolving credit facility |  |  | $ 30,000,000 |
Prior to April 1, 2014 [Member] | Second Amendment [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee |  |  | 0.20% |
Prior to April 1, 2014 [Member] | Second Amendment [Member] | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.25% |
Prior to April 1, 2014 [Member] | Second Amendment [Member] | Excess of Base Rate Domestic Borrowings Only [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 0.25% |
Prior to April 1, 2014 [Member] | Second Amendment [Member] | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.25% |
Prior to April 1, 2014 [Member] | Second Amendment [Member] | Standby Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 1.25% |
Prior to April 1, 2014 [Member] | Second Amendment [Member] | Performance Letters of Credit [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt Instrument Basis Spread On Variable Rate |  |  | 0.75% |

X
- Definition 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. + References No definition available. + Details
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- Definition Cross-default provisions. + References No definition available. + Details
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- Definition Option to increase revolving commitments under credit agreement. + References No definition available. + Details
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- Definition Percentage of capital stock of direct foreign subsidiaries required to secure credit agreement. + References No definition available. + Details
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- Definition Reduction in Quanta's maximum funded debt and maximum senior debt by all cash and cash equivalents in excess of amount. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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