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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 Segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Reserve for uncollectible accounts |  | $ 34.7 | $ 38.6 |
Number of reportable segments | Segment | 2 |  |  |
Number of Reporting Units | Segment | 2 |  |  |
Accrual for estimated claims |  | 39.1 | $ 38.8 |
Federal and State [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
State and federal tax net operating losses, valuation allowance |  | $ 1.2 |  |
Software Development [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets estimated useful life |  | 10 years |  |
Leasehold Improvements [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
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Minimum [Member] | Investees [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage |  | 50.00% |  |
Maximum [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Service [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk (as a percentage) |  | 10.00% | 10.00% | 10.00%
Maximum [Member] | Building And Improvement [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment estimated life |  | 40 years |  |
Maximum [Member] | Computer Equipment and Software [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment estimated life |  | 10 years |  |
Maximum [Member] | Furniture and Equipment [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment estimated life |  | 10 years |  |
Maximum [Member] | Transportation Equipment [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment estimated life |  | 16 years |  |

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