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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue Recognition [Line Items] |  |  |  |
Remaining performance obligation |  | $ 3,990,000 | $ 5,300,000 |
Revenues recognized related to change orders and claims |  | $ 141,200 | $ 170,000 |
Change in contract estimates, favorable (unfavorable) impact on operating results, percent (less than) |  | 5.00% | 5.00% | 5.00%
Percent of total revenues recognized associated with revenue recognition method |  | 47.90% | 50.00% | 57.70%
Change in contract estimates, favorable (unfavorable) impact on revenues |  | $ 27,000 |  |
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period |  | 491,500 |  |
Allowances for doubtful accounts on current receivables |  | 16,546 | $ 9,398 |
Long-term accounts receivable, net |  | 13,367 | 12,427 |
Current retainage balances |  | 306,300 | 299,600 |
Non-current retainage balances |  | 88,200 | 54,200 |
Unbilled receivables |  | 472,300 | 524,300 | $ 434,900
Unearned revenues |  | 53,562 | 33,192 |
Accounts Payable and Accrued Expenses |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Unearned revenues |  | 53,600 | 33,200 | 40,100
Two Larger Pipleline Projects - Canada |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  | 10,000 |  |
Larger Electric Transmission Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  | (20,800) |  |
Several Projects |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  | 35,500 |  |
EPC Electric Transmission Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results | $ (30,100) |  |  | (52,200)
Larger Pipeline Transmission Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  | (22,900) |
Larger Natural Gas Transmission Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  | (16,200) |
Electric Transmission Project - Southern California |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  | 21,100 |
Contract value |  | $ 407,000 |  |
Percentage of project completion |  | 95.00% |  |
Peru Telecommunications Project | Correction of Total Estimated Project Costs | Restatement Adjustment |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  | 9,600 |
Processing Facility Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  | $ 29,400 | 34,200
Electric Power Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  |  | 22,300
$50 Million Lump Sum Natural Gas Pipeline Construction Project |  |  |  |
Revenue Recognition [Line Items] |  |  |  |
Change in contract estimates, (favorable) unfavorable impact on operating results |  |  |  | $ 17,300

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