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Debt Obligations - Senior Secured Credit Facility (Details)
23 Months Ended
Oct. 10, 2018
USD ($)
Nov. 20, 2017
USD ($)
Nov. 19, 2017
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]          
Amount borrowed under the credit facility       $ 1,070,299,000 $ 668,427,000
Letters Of Credit and Bank Guarantees          
Line of Credit Facility [Line Items]          
Letters of credit and bank guarantees under the credit facility       412,900,000  
Senior Secured Credit Facility          
Line of Credit Facility [Line Items]          
Option to increase revolving commitments under the credit agreement $ 400,000,000        
Amount borrowed under the credit facility       1,070,000,000.00  
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      
Percentage of capital stock of direct foreign subsidiaries of wholly owned U.S. subsidiaries to secure credit agreement   65.00%      
Maximum consolidated leverage ratio   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      
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      
Cross default provisions with debt instruments exceeding this amount   $ 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]          
Senior secured revolving credit facility 1,990,000,000        
Amount borrowed under the credit facility       477,800,000  
Credit facility available for revolving loans or issuing new letters of credit       1,090,000,000.00  
Senior Secured Credit Facility | Revolving Credit Facility | U.S. Dollars          
Line of Credit Facility [Line Items]          
Amount borrowed under the credit facility       883,800,000  
Letters of credit and bank guarantees under the credit facility       242,200,000  
Senior Secured Credit Facility | Revolving Credit Facility | Canadian Dollars          
Line of Credit Facility [Line Items]          
Amount borrowed under the credit facility       102,600,000  
Senior Secured Credit Facility | Revolving Credit Facility | Australian Dollars          
Line of Credit Facility [Line Items]          
Amount borrowed under the credit facility       83,900,000  
Senior Secured Credit Facility | Revolving Credit Facility | Canadian and Australian Dollars          
Line of Credit Facility [Line Items]          
Letters of credit and bank guarantees under the credit facility       170,700,000  
Senior Secured Credit Facility | Term Loan          
Line of Credit Facility [Line Items]          
Senior secured revolving credit facility 600,000,000.0        
Amount borrowed under the credit facility       $ 592,500,000  
Required quarterly principal payment amount $ 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%        
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 | 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%