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Debt Obligations - Additional Information (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility $ 318,500,000  
Amount borrowed under the credit facility 339,159,000 $ 68,793,000
Credit facility available for revolving loans or issuing new letters of credit 667,300,000  
Letters Of Credit and Bank Guarantees [Member]    
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility 318,500,000  
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 226,100,000  
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 92,400,000  
Borrowings Under Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility 339,159,000  
Borrowings Under Credit Facility [Member] | U S Dollar [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility 241,500,000  
Borrowings Under Credit Facility [Member] | Canadian Dollars [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility 97,700,000  
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 $ 75,000,000  
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%  
Prior and After April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Senior secured revolving credit facility $ 1,325,000,000  
Maturity date of senior secured revolving credit facility Oct. 30, 2018  
Option to increase revolving commitments under the credit agreement $ 300,000,000  
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 50,000,000  
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 30,000,000  
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 $ 20,000,000  
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 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%