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v3.20.2

Debt Obligations - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Oct. 31, 2018 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Borrowings under credit facility |  |  |  |  | $ 500,727,000 | $ 1,068,439,000 | $ 1,975,179,000 | $ 2,715,513,000 |
Amount borrowed under the credit facility |  |  |  |  | 1,361,841,000 |  | 1,361,841,000 |  | $ 1,346,290,000
Senior Secured Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Option to increase revolving commitments under the credit agreement |  |  |  |  | 400,000,000.0 |  | $ 400,000,000.0 |  |
Maximum consolidated leverage ratio permissible under credit agreement |  |  |  |  |  |  | 2.5 |  |
Amount borrowed under the credit facility |  |  |  |  | 1,360,000,000 |  | $ 1,360,000,000 |  |
Credit facility available for revolving loans or issuing new letters of credit |  |  |  |  | $ 1,610,000,000 |  | 1,610,000,000 |  |
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 |  |
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. Dollar |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Amount borrowed under the credit facility |  |  |  |  | 1,210,000,000 |  | $ 1,210,000,000 |  |
Senior Secured Credit Facility | Canadian Dollars |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Amount borrowed under the credit facility |  |  |  |  | 111,900,000 |  | 111,900,000 |  |
Senior Secured Credit Facility | Australian Dollars |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Amount borrowed under the credit facility |  |  |  |  | 40,700,000 |  | 40,700,000 |  |
Senior Secured Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  | 2,140,000,000 |  | 2,140,000,000 |  |
Amount borrowed under the credit facility |  |  |  |  | 152,600,000 |  | 152,600,000 |  |
Senior Secured Credit Facility | Term Loan |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  | 1,290,000,000 |  | 1,290,000,000 |  |
Borrowings under credit facility |  |  | $ 687,500,000 | $ 600,000,000.0 |  |  |  |  |
Amount borrowed under the credit facility |  |  |  |  | 1,210,000,000 |  | $ 1,210,000,000 |  |
Quarterly amortization payment | $ 16,100,000 | $ 7,500,000 |  |  |  |  |  |  |
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 | U.S. Dollar |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  | 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 |  |
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 |  |
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 |  |
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 |  |  |  |  | 254,800,000 |  | 254,800,000 |  |
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 |  |  |  |  | 119,900,000 |  | 119,900,000 |  |
Senior Secured Credit Facility | Letters of Credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit and bank guarantees |  |  |  |  | $ 374,700,000 |  | $ 374,700,000 |  |
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% |  |

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