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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | $ 6,907 |
Impact of new accounting standard | 695 |
Bad debt expense (benefit) | 5,318 | $ 2,093
Deductions for uncollectible receivables written off, net of recoveries | (1,536) |
Credit allowance of acquired companies on the acquisition date | 502 |
Purchase accounting adjustments | 72 |
Reclass to other current liabilities | (315) |
Balance at March 31, 2020 | 11,643 |
Service |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | 3,192 |
Impact of new accounting standard | 310 |
Bad debt expense (benefit) | 2,651 |
Deductions for uncollectible receivables written off, net of recoveries | (913) |
Balance at March 31, 2020 | 5,240 |
Construction |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | 3,400 |
Impact of new accounting standard | 331 |
Bad debt expense (benefit) | 2,678 |
Deductions for uncollectible receivables written off, net of recoveries | (623) |
Credit allowance of acquired companies on the acquisition date | 502 |
Purchase accounting adjustments | 72 |
Balance at March 31, 2020 | 6,360 |
Other. |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |
Balance at beginning of year | 315 |
Impact of new accounting standard | 54 |
Bad debt expense (benefit) | (11) |
Reclass to other current liabilities | (315) |
Balance at March 31, 2020 | $ 43 |

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