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Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) unit numberOfProjects | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) unit numberOfProjects | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Revenue Recognition [Line Items] |  |  |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results, amount | $ (41,900) |  | $ (48,700) | $ (127,400) |  |
Change in contract estimates, (favorable) unfavorable impact on operating results, percent | (7.80%) |  | (9.60%) | (9.40%) | (5.00%) |
Revenues recognized related to change orders and claims | $ 254,100 |  |  | $ 254,100 |  | $ 141,200
Number of delayed transmission projects due to changes orders and claims | numberOfProjects | 2 |  |  | 2 |  |
Number of projects that experienced a significant impact due accelerated timeline | unit | 1 |  |  | 1 |  |
Percent of total revenues recognized associated with revenue recognition method | 42.50% |  | 47.90% | 43.40% | 48.40% |
Revenue, related to performance obligation satisfied in previous periods |  |  |  | $ 151,700 |  |
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period |  |  |  | 381,900 |  |
Provision for credit losses | $ 249 |  | $ 1,566 | 24,169 | $ 2,910 |
Current retainage balances | 295,900 |  |  | 295,900 |  | 306,300
Non-current retainage balances | 88,200 |  |  | 88,200 |  | 88,200
Unbilled receivables | 827,300 |  |  | 827,300 |  | 472,300
Latin America |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results, amount |  |  | 12,100 |  | 28,600 |
Limetree Bay Refining, LLC |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Accounts receivable, before allowance for credit loss | 31,300 |  |  | 31,300 |  |
Limetree Bay Terminals, LLC |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Accounts receivable, before allowance for credit loss | 700 |  |  | 700 |  |
Limetree Bay Refining, LLC And Limetree Terminal, LLC |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Provision for credit losses |  | $ 23,600 |  |  |  |
Accounts receivable | 8,400 |  |  | 8,400 |  |
Accounts Payable and Accrued Expenses |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Unearned revenues, current portion | $ 39,500 |  |  | $ 39,500 |  | $ 53,600
Larger Pipeline Transmission Projects |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results, amount |  |  | $ (32,900) |  | $ (15,100) |

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