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Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |
Reserve for uncollectible accounts | $ 20.1 | $ 8.3 |
Accrual for estimated claims | 30.8 | $ 32.1 |
Federal and State [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
State and federal tax net operating losses, valuation allowance | $ 5.0 |  |
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] |  |  |
Property and equipment estimated life, description | the shorter of useful life or lease term |  |
Minimum [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] |  |  |
Minimum percentage of revenue accounted for by one customer | 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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