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Debt Obligations - Narrative (Details) | Oct. 10, 2018 USD ($) | Nov. 20, 2017 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | $ 1,372,050,000 | $ 1,070,299,000
Credit facility available for revolving loans or issuing new letters of credit |  |  | 812,900,000 |
Borrowings under Credit Facility | Canadian Dollars |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | 123,600,000 |
Borrowings under Credit Facility | Australian Dollars |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | 36,200,000 |
Letters of Credit and Bank Guarantees |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees |  |  | 385,000,000.0 |
Letters of Credit and Bank Guarantees | U.S. Dollar |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees |  |  | 240,600,000 |
Letters of Credit and Bank Guarantees | Primarily Canadian and Australian Dollars |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Letters of credit and bank guarantees |  |  | 144,400,000 |
Senior Secured Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Option to increase revolving commitments under the credit agreement | $ 400,000,000.0 |  |  |
Amount borrowed under the credit facility |  |  | 1,370,000,000 |
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 |  |
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 |  |
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] |  |  |  |
Borrowing capacity | 1,990,000,000 |  |  |
Amount borrowed under the credit facility |  |  | 787,100,000 |
Senior Secured Credit Facility | Revolving Credit Facility | U.S. Dollar |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Amount borrowed under the credit facility |  |  | 1,210,000,000 |
Senior Secured Credit Facility | Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowing capacity | 600,000,000.0 |  |  |
Amount borrowed under the credit facility |  |  | $ 585,000,000.0 |
Quarterly amortization payment | $ 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 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowing capacity | $ 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 |  |  |
Senior Secured Credit Facility | Swing Lines Loan | Canadian Dollars |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Borrowing capacity | 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 |  |  |
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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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