Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Reserve for uncollectible accounts	$ 38.6	$ 20.1
Accrual for estimated claims	38.8	$ 30.8
Federal and State [Member]
Summary Of Significant Accounting Policies [Line Items]
State and federal tax net operating losses, valuation allowance	$ 1.6
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] | 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]
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