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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%