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Commitments and Contingencies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) employee collective_bargaining_agreement | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of collective bargaining agreements that are national or regional in scope | collective_bargaining_agreement | 2 |  |
Restructuring expenses | $ 2,214 | $ 1,523 | $ 2,306
Restructuring reserve | $ 2,697 | 1,558 | 1,630
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Number of employees | employee | 33,000 |  |
Number of collective bargaining agreements between our individual subsidiaries and local unions | collective_bargaining_agreement | 400 |  |
Surety Bond [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Aggregate estimated exposure, certain performance obligations | $ 1,300,000 |  |
Aggregate estimated exposure, certain performance obligations, percentage | 29.00% |  |
Aggregate estimated exposure, other contractual obligations | $ 37,500 |  |
Employee Severance [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restructuring expenses | $ 2,200 | $ 1,500 | $ 2,300
Unionized Employees Concentration Risk [Member] | Workforce Subject to Collective Bargaining Arrangements [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Percentage of employees represented by unions | 59.00% |  |

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