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Debt Obligations - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 12, 2019
USD ($)
Sep. 30, 2019
USD ($)
Oct. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]                  
Borrowings under credit facility         $ 2,118,501,000 $ 855,831,000 $ 4,834,014,000 $ 2,893,224,000  
Amount borrowed under the credit facility   $ 1,865,930,000     1,865,930,000   1,865,930,000   $ 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   1,870,000,000     1,870,000,000   1,870,000,000    
Credit facility available for revolving loans or issuing new letters of credit   $ 1,180,000,000     $ 1,180,000,000   1,180,000,000    
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   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   $ 100,000,000.0    
Cross default provisions with debt instruments exceeding this amount   150,000,000.0     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 | Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Borrowing capacity $ 2,140,000,000                
Amount borrowed under the credit facility   608,400,000     608,400,000   $ 608,400,000    
Senior Secured Credit Facility | Revolving Credit Facility | U.S. Dollar                  
Line of Credit Facility [Line Items]                  
Amount borrowed under the credit facility   1,650,000,000     1,650,000,000   1,650,000,000    
Senior Secured Credit Facility | Term Loan                  
Line of Credit Facility [Line Items]                  
Borrowing capacity $ 1,290,000,000                
Borrowings under credit facility   687,500,000 $ 600,000,000.0            
Amount borrowed under the credit facility   1,260,000,000     1,260,000,000   1,260,000,000    
Quarterly amortization payment             $ 7,500,000    
Senior Secured Credit Facility | Term Loan | Forecast                  
Line of Credit Facility [Line Items]                  
Quarterly amortization payment       $ 16,100,000          
Senior Secured Credit Facility | Term Loan | Eurocurrency Rate | Minimum                  
Line of Credit Facility [Line Items]                  
Debt instrument basis spread on variable rate             1.125%    
Senior Secured Credit Facility | Term Loan | Eurocurrency Rate | Maximum                  
Line of Credit Facility [Line Items]                  
Debt instrument basis spread on variable rate             1.875%    
Senior Secured Credit Facility | Revolving Loans and Letters of Credit in Alternative Currencies                  
Line of Credit Facility [Line Items]                  
Borrowing capacity   600,000,000.0     600,000,000.0   $ 600,000,000.0    
Senior Secured Credit Facility | Swing Lines Loan | U.S. Dollar                  
Line of Credit Facility [Line Items]                  
Borrowing capacity   100,000,000.0     100,000,000.0   100,000,000.0    
Senior Secured Credit Facility | Swing Lines Loan | Canadian Dollars                  
Line of Credit Facility [Line Items]                  
Borrowing capacity   50,000,000.0     50,000,000.0   50,000,000.0    
Senior Secured Credit Facility | Swing Lines Loan | Australian Dollars                  
Line of Credit Facility [Line Items]                  
Borrowing capacity   50,000,000.0     50,000,000.0   50,000,000.0    
Senior Secured Credit Facility | Borrowings under Credit Facility | Canadian Dollars                  
Line of Credit Facility [Line Items]                  
Amount borrowed under the credit facility   169,900,000     169,900,000   169,900,000    
Senior Secured Credit Facility | Borrowings under Credit Facility | Australian Dollars                  
Line of Credit Facility [Line Items]                  
Amount borrowed under the credit facility   42,200,000     42,200,000   42,200,000    
Senior Secured Credit Facility | Letters of Credit and Bank Guarantees | U.S. Dollar                  
Line of Credit Facility [Line Items]                  
Letters of credit and bank guarantees   235,500,000     235,500,000   235,500,000    
Senior Secured Credit Facility | Letters of Credit and Bank Guarantees | Primarily Canadian and Australian Dollars                  
Line of Credit Facility [Line Items]                  
Letters of credit and bank guarantees   $ 111,000,000.0     $ 111,000,000.0   $ 111,000,000.0    
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%