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Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) pool | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) pool | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
ASU, credit loss |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |
Revenues recognized related to change orders and claims | $ 144,500 |  | $ 144,500 |  |  |  | $ 170,000 |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount | $ 48,700 | $ 29,200 |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, percent (less than for quarter-to-date and year to date 2020 and year-to-date 2019) | 9.60% | 6.20% | 5.00% | 5.00% |  |  |  |  |  |
Percent of total revenues recognized associated with revenue recognition method | 47.90% | 51.30% | 48.40% | 50.80% |  |  |  |  |  |
Revenue, related to performance obligation satisfied in previous periods |  |  | $ 85,200 |  |  |  |  |  |  |
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period |  |  | 426,500 |  |  |  |  |  |  |
Stockholders' equity | $ 4,155,566 | $ 3,909,207 | 4,155,566 | $ 3,909,207 | $ 3,918,002 | $ 3,795,178 | 4,053,831 | $ 3,776,259 | $ 3,725,057 | $ 3,605,453
Allowances on accounts receivable, current | 16,404 |  | 16,404 |  |  |  | 9,398 |  |  |
Deferred income taxes | $ (206,280) |  | $ (206,280) |  |  |  | (214,779) |  |  |
Number of pools used for the purpose of calculating its historical credit loss experience | pool | 1 |  | 1 |  |  |  |  |  |  |
Long-term accounts receivable | $ 12,600 |  | $ 12,600 |  |  |  | 12,600 |  |  |
Current retainage balances | 340,500 |  | 340,500 |  |  |  | 299,600 |  |  |
Non-current retainage balances | 60,600 |  | 60,600 |  |  |  | 54,200 |  |  |
Unbilled receivables | 721,400 |  | 721,400 |  |  |  | 524,300 |  |  |
Latin America |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount | $ (12,100) |  | $ (28,600) |  |  |  |  |  |  |
Percentage of project completion | 80.00% |  | 80.00% |  |  |  |  |  |  |
Accounts Payable and Accrued Expenses |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Unearned revenues | $ 36,000 |  | $ 36,000 |  |  |  | 33,200 |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity | 3,103,849 | 2,743,498 | 3,103,849 | 2,743,498 | $ 2,948,180 | $ 2,881,416 | 2,854,271 | $ 2,612,994 | $ 2,591,883 | $ 2,477,291
Adjustment due to Adoption of New ASU |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  | (3,841) |  |  |
Allowances on accounts receivable, current |  |  |  |  |  |  | 5,100 |  |  |
Deferred income taxes |  |  |  |  |  |  | 1,200 |  |  |
Adjustment due to Adoption of New ASU | Retained Earnings |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  |  |  | $ (3,841) |  |  |
Pipeline Transmission Project - Canada - Project |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated cost to complete | 7,800 |  | 7,800 |  |  |  |  |  |  |
Larger Pipeline Transmission Project |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount | 32,900 |  | 15,100 |  |  |  |  |  |  |
Pipeline Transmission Project - United States |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount |  | 22,200 |  | 21,600 |  |  |  |  |  |
Electric Transmission Project - Southern California |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount |  | $ (11,000) |  | (20,400) |  |  |  |  |  |
Contract value | $ 404,300 |  | $ 404,300 |  |  |  |  |  |  |
Percentage of project completion | 93.00% |  | 93.00% |  |  |  |  |  |  |
EPC Electric Transmission Project |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount |  |  |  | 30,100 |  |  |  |  |  |
Processing Facility Construction Project - Texas |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount |  |  |  | $ (24,300) |  |  |  |  |  |

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