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Construction Contracts - Summary of Backlog (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Revenue, Remaining Performance Obligation [Roll Forward] |  |
Beginning backlog | $ 71,258 | $ 242,622
New contracts/change orders | 3,124 | 40,440
Work performed | (35,544) | (47,420)
Ending backlog | $ 38,838 | $ 235,642
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Expected completion of contracts | 12 months |
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Expected completion of contracts | 18 months |

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