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Debt Obligations - Senior Secured Credit Facility (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 23 Months Ended
Sep. 12, 2019
USD ($)
Oct. 10, 2018
Nov. 20, 2017
Nov. 19, 2017
USD ($)
Sep. 30, 2019
USD ($)
Oct. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 19, 2017
USD ($)
Line of Credit Facility [Line Items]                        
Borrowings under credit facility                 $ 6,175,558,000 $ 4,491,782,000 $ 2,932,338,000  
Amount borrowed under the credit facility             $ 1,346,290,000   1,346,290,000 $ 1,070,299,000    
Senior Secured Credit Facility                        
Line of Credit Facility [Line Items]                        
Option to increase revolving commitments under the credit agreement $ 400,000,000.0                      
Maximum consolidated leverage ratio permissible under credit agreement 2.5                      
Amount borrowed under the credit facility             1,350,000,000   1,350,000,000      
Increase in maximum additional interest rates and fee percentages                       0.125%
Reduction in Quanta's funded indebtedness reduced by cash and cash equivalents in excess of this amount       $ 25,000,000.0                
Maximum consolidated leverage ratio       3.0               3.0
Acquisition threshold for leverage ratio       $ 200,000,000.0                
Maximum leverage ratio acquisition completed in current and two subsequent quarters       3.5                
Minimum consolidated interest coverage ratio       3.0                
Percentage of capital stock of direct foreign subsidiaries of wholly owned U.S. subsidiaries 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       $ 100,000,000.0               $ 100,000,000.0
Cross default provisions with debt instruments exceeding this amount       $ 150,000,000.0               $ 150,000,000.0
Senior Secured Credit Facility | Minimum                        
Line of Credit Facility [Line Items]                        
Commitment fee     0.20%                  
Senior Secured Credit Facility | Maximum                        
Line of Credit Facility [Line Items]                        
Commitment fee     0.40%                  
Senior Secured Credit Facility | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only | Minimum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       1.125%                
Senior Secured Credit Facility | Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only | Maximum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       2.00%                
Senior Secured Credit Facility | Excess of Base Rate Domestic Borrowings Only | Minimum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       0.125%                
Senior Secured Credit Facility | Excess of Base Rate Domestic Borrowings Only | Maximum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       1.00%                
Senior Secured Credit Facility | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings | Minimum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       1.125%                
Senior Secured Credit Facility | Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings | Maximum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       2.00%                
Senior Secured Credit Facility | Excess of Federal Funds Rate                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       0.50%                
Senior Secured Credit Facility | Excess of Euro Currency Rate                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       1.00%                
Senior Secured Credit Facility | U.S. Dollars                        
Line of Credit Facility [Line Items]                        
Amount borrowed under the credit facility             1,250,000,000   1,250,000,000      
Senior Secured Credit Facility | Canadian Dollars                        
Line of Credit Facility [Line Items]                        
Amount borrowed under the credit facility             61,600,000   61,600,000      
Senior Secured Credit Facility | Australian Dollars                        
Line of Credit Facility [Line Items]                        
Amount borrowed under the credit facility             39,300,000   39,300,000      
Senior Secured Credit Facility | Revolving Credit Facility                        
Line of Credit Facility [Line Items]                        
Senior secured revolving credit facility $ 2,140,000,000                      
Amount borrowed under the credit facility             104,900,000   104,900,000      
Credit facility available for revolving loans or issuing new letters of credit             1,650,000,000   1,650,000,000      
Senior Secured Credit Facility | Revolving Loans and Letters of Credit | U.S. Dollars                        
Line of Credit Facility [Line Items]                        
Senior secured revolving credit facility 600,000,000.0                      
Senior Secured Credit Facility | Swing Lines Loan | U.S. Dollars                        
Line of Credit Facility [Line Items]                        
Senior secured revolving credit facility 100,000,000.0                      
Senior Secured Credit Facility | Swing Lines Loan | Canadian Dollars                        
Line of Credit Facility [Line Items]                        
Senior secured revolving credit facility 50,000,000.0                      
Senior Secured Credit Facility | Swing Lines Loan | Australian Dollars                        
Line of Credit Facility [Line Items]                        
Senior secured revolving credit facility 50,000,000.0                      
Senior Secured Credit Facility | Letters of Credit and Bank Guarantees | U.S. Dollars                        
Line of Credit Facility [Line Items]                        
Letters of credit and bank guarantees under the credit facility             252,600,000   252,600,000      
Senior Secured Credit Facility | Letters of Credit and Bank Guarantees | Canadian and Australian Dollars                        
Line of Credit Facility [Line Items]                        
Letters of credit and bank guarantees under the credit facility             131,200,000   131,200,000      
Senior Secured Credit Facility | Letters of Credit                        
Line of Credit Facility [Line Items]                        
Letters of credit and bank guarantees under the credit facility             383,800,000   383,800,000      
Senior Secured Credit Facility | Standby Letters of Credit | Minimum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       1.125%                
Senior Secured Credit Facility | Standby Letters of Credit | Maximum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       2.00%                
Senior Secured Credit Facility | Performance Letters of Credit | Minimum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       0.675%                
Senior Secured Credit Facility | Performance Letters of Credit | Maximum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate       1.15%                
Senior Secured Credit Facility | Term Loan                        
Line of Credit Facility [Line Items]                        
Senior secured revolving credit facility $ 1,290,000,000                      
Borrowings under credit facility         $ 687,500,000 $ 600,000,000.0            
Amount borrowed under the credit facility             1,240,000,000   $ 1,240,000,000      
Required quarterly principal payment amount             $ 16,100,000 $ 7,500,000        
Senior Secured Credit Facility | Term Loan | Excess of Eurocurrency Rate Based on Leverage Ratio | Minimum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate   1.125%                    
Senior Secured Credit Facility | Term Loan | Excess of Eurocurrency Rate Based on Leverage Ratio | Maximum                        
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate   1.875%