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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2022 USD ($) | Dec. 31, 2022 USD ($) ft² LetterOfCredit Employee | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Number of square feet | ft² |  | 360,000 |  |
Number of employees will accommodate at new facility | Employee |  | 2,000 |  |
Total rent expense |  | $ 176,600,000 | $ 153,400,000 | $ 154,000,000.0
Aggregate amount of maximum earnout obligations related to acquisitions |  | 1,946,200,000 | 1,873,900,000 |
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet |  | 1,077,300,000 | 988,500,000 |
Aggregate amount of earnout obligation expected settlement in cash or stock at option |  | 734,000,000.0 | 670,300,000 |
Aggregate amount of earnout obligation expected settlement in cash |  | 343,300,000 | $ 318,200,000 |
Debt |  | 16,800,000 |  |
Liabilities recorded on self-insurance |  | 17,400,000 |  |
Income tax credits and adjustments |  | $ 108,000,000.0 |  |
Security Deposit [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Number of letters of credit issued | LetterOfCredit |  | 2 |  |
Collateral [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Number of letters of credit issued | LetterOfCredit |  | 1 |  |
Self-Insurance Deductibles [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Number of letters of credit issued | LetterOfCredit |  | 2 |  |
Rent-A-Captive Facility [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Number of letters of credit issued | LetterOfCredit |  | 7 |  |
Errors And Omissions [Member] | Up to $4.5 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claims, amount retained |  | $ 2,000,000.0 |  |
Errors And Omissions [Member] | Up to $10 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claims, amount retained |  | 15,000,000.0 |  |
Insurance claim arise during ordinary course of business |  | 15,000,000.0 |  |
Errors And Omissions [Member] | Up to $20.0 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claims, amount retained |  | 0.0 |  |
Errors And Omissions [Member] | Up to $27.0 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claims, amount retained |  | 0.0 |  |
Letter of Credit [Member] | Security Deposit [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Debt |  | 500,000 |  |
Letter of Credit [Member] | Collateral [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Debt |  | 800,000 |  |
Letter of Credit [Member] | Self-Insurance Deductibles [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Debt |  | 9,200,000 |  |
Liabilities recorded on self-insurance |  | 17,400,000 |  |
Letter of Credit [Member] | Rent-A-Captive Facility [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Debt |  | 2,500,000 |  |
BCHR Holdings, L.P [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Initial gross consideration | $ 660,000,000.0 |  |  |
Net of agreed seller funded expenses and net working capital | $ 585,000,000.0 |  |  |
Minimum [Member] | Errors And Omissions [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Actuarial range value |  | 10,000,000.0 |  |
Minimum [Member] | Errors And Omissions [Member] | Up to $4.5 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claim arise during ordinary course of business |  | 15,000,000.0 |  |
Minimum [Member] | Errors And Omissions [Member] | Up to $20.0 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claim arise during ordinary course of business |  | 100,000,000.0 |  |
Minimum [Member] | Errors And Omissions [Member] | Up to $27.0 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claim arise during ordinary course of business |  | $ 225,000,000.0 |  |
Minimum [Member] | Unconsolidated Investments in Enterprises [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Ownership interest |  | 1.00% |  |
Maximum [Member] | Errors And Omissions [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Actuarial range value |  | $ 1,800,000 |  |
Maximum [Member] | Errors And Omissions [Member] | Up to $4.5 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claim arise during ordinary course of business |  | 100,000,000.0 |  |
Maximum [Member] | Errors And Omissions [Member] | Up to $20.0 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claim arise during ordinary course of business |  | 225,000,000.0 |  |
Maximum [Member] | Errors And Omissions [Member] | Up to $27.0 Million [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Insurance claim arise during ordinary course of business |  | $ 0.0 |  |
Maximum [Member] | Unconsolidated Investments in Enterprises [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
Tax Increment Financing [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Property tax credits receivable period |  | 15 years |  |
Economic development for growing economy tax credit |  | $ 41,400,000 |  |
Tax Increment Financing [Member] | Minimum [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Property tax credit expect to receive |  | 50,000,000.0 |  |
Tax Increment Financing [Member] | Maximum [Member] |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |
Property tax credit expect to receive |  | $ 80,000,000.0 |  |

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