Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Additional Information (Detail)

v3.2.0.727
Debt Obligations - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility $ 324,700,000  
Amount borrowed under the credit facility 204,255,000 $ 68,793,000
Credit facility available for revolving loans or issuing new letters of credit 796,000,000  
U S Dollar [Member]    
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility 223,100,000  
Amount borrowed under the credit facility 95,000,000  
Canadian Dollars [Member]    
Line of Credit Facility [Line Items]    
Amount borrowed under the credit facility 109,300,000  
Canada and Australia Dollar [Member]    
Line of Credit Facility [Line Items]    
Letters of credit and bank guarantees under the credit facility 101,600,000  
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  
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 to April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Commitment fee 0.20%  
Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Commitment fee 0.20%  
Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Commitment fee 0.40%  
Standby Letters of Credit [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.25%  
Standby Letters of Credit [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.125%  
Standby Letters of Credit [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 2.125%  
Performance Letters of Credit [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 0.75%  
Performance Letters of Credit [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 0.675%  
Performance Letters of Credit [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.275%  
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.25%  
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.125%  
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 2.125%  
Excess of Base Rate Domestic Borrowings Only [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 0.25%  
Excess of Base Rate Domestic Borrowings Only [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 0.125%  
Excess of Base Rate Domestic Borrowings Only [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.125%  
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Prior to April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.25%  
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Minimum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.125%  
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member] | Maximum [Member] | Effective April 1, 2014 [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 2.125%  
Excess of Federal Funds Rate [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 0.50%  
Excess of Euro Currency Rate [Member] | Second Amendment [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument Basis Spread On Variable Rate 1.00%  
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | U S Dollar [Member]    
Line of Credit Facility [Line Items]    
Senior secured revolving credit facility $ 50,000,000  
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Canadian Dollars [Member]    
Line of Credit Facility [Line Items]    
Senior secured revolving credit facility 30,000,000  
Swing Line Loans [Member] | Prior and After April 1, 2014 [Member] | Second Amendment [Member] | Australian Dollars [Member]    
Line of Credit Facility [Line Items]    
Senior secured revolving credit facility $ 20,000,000