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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Revenue Recognition [Line Items] |  |  |  |  |
Revenues recognized related to change orders and claims | $ 131,700 |  | $ 131,700 |  | $ 121,800
Change in contract estimates, favorable (unfavorable) impact on operating results, percent | (6.40%) |  | (2.70%) |  |
Impact on earnings | $ 319,505 | $ 333,371 | $ 683,486 | $ 634,419 |
Percent of total revenues recognized associated with revenue recognition method | 49.10% | 54.90% | 50.50% | 54.40% |
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period |  |  | $ 329,000 |  |
Revenue, related to performance obligation satisfied in previous periods |  |  | 10,300 |  |
Allowances for doubtful accounts on current receivables | $ 8,541 |  | 8,541 |  | 5,839
Long-term accounts receivable | 53,300 |  | 53,300 |  | 25,900
Current retainage balances | 468,100 |  | 468,100 |  | 337,100
Non-current retainage balances | 34,300 |  | 34,300 |  | 99,600
Unbilled receivables | 605,500 |  | 605,500 |  | 434,900
Unearned revenues included in accounts payable and accrued expenses | 1,289,393 |  | 1,289,393 |  | 1,314,520
Termination of the Peru Telecommunications Project |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Contract asset impairment |  |  | 29,400 |  |
Termination of the Peru Telecommunications Project | Correction of Estimated Project Costs and Percentage-of-Completion Method | Adjustment |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Impact on earnings | (14,500) |  | (9,600) |  |
Unearned Revenue |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Unearned revenues included in accounts payable and accrued expenses | 29,100 |  | 29,100 |  | $ 40,100
PG&E |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Long-term accounts receivable | 41,200 |  | 41,200 |  |
Processing Facility Project |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount | (13,900) |  | (22,300) |  |
Contract value | $ 141,000 |  | $ 141,000 |  |
Percent of project completion | 96.00% |  | 96.00% |  |
EPC Electric Transmission Project |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results, amount |  | $ 16,600 | $ 28,200 | $ 26,300 |

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