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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 249 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 29, 2022 USD ($) | Oct. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) ft² LetterOfCredit Entity | Sep. 30, 2021 Entity | Sep. 30, 2022 USD ($) ft² LetterOfCredit Entity | Sep. 30, 2021 Entity | Sep. 30, 2022 USD ($) ft² Entity LetterOfCredit
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Number of square feet | ft² |  |  | 360,000 |  | 360,000 |  | 360,000
Number of companies acquired | Entity |  |  | 27 | 44 | 70 | 80 | 641
Aggregate amount of maximum earnout obligations related to acquisitions |  |  |  |  | $ 1,712,900,000 |  |
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet |  |  |  |  | 816,300,000 |  |
Aggregate amount of earnout obligation expected settlement in cash or stock at option |  |  | $ 541,800,000 |  | 541,800,000 |  | $ 541,800,000
Aggregate amount of earnout obligation expected settlement in cash |  |  | 274,500,000 |  | 274,500,000 |  | 274,500,000
Litigation, cash settlements |  | $ 55,000,000.0 |  |  |  |  |
Litigation settlement gain, net of litigation costs and taxes |  | $ 35,000,000.0 |  |  |  |  |
Debt |  |  | $ 9,300,000 |  | 9,300,000 |  | $ 9,300,000
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 |  | 2 |  | 2
Collateral [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Number of letters of credit issued | LetterOfCredit |  |  | 1 |  | 1 |  | 1
Self-Insurance Deductibles [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Number of letters of credit issued | LetterOfCredit |  |  | 2 |  | 2 |  | 2
Rent-A-Captive Facility [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Number of letters of credit issued | LetterOfCredit |  |  | 7 |  | 7 |  | 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 |  | 15,000,000.0 |  | $ 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 |  |  |  |  | 10,000,000.0 |  |
Errors And Omissions [Member] | Up to $27.0 Million [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Insurance claims, amount retained |  |  |  |  | 20,000,000.0 |  |
Letter of Credit [Member] | Security Deposit [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Debt |  |  | 500,000 |  | 500,000 |  | 500,000
Letter of Credit [Member] | Collateral [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Debt |  |  | 800,000 |  | 800,000 |  | 800,000
Letter of Credit [Member] | Self-Insurance Deductibles [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Liabilities recorded on self-insurance |  |  | 17,500,000 |  | 17,500,000 |  | 17,500,000
Letter of Credit [Member] | Rent-A-Captive Facility [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Debt |  |  | 2,400,000 |  | 2,400,000 |  | 2,400,000
Minimum [Member] | Errors And Omissions [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Actuarial range value |  |  | 4,500,000 |  | 4,500,000 |  | 4,500,000
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 |  | 15,000,000.0 |  | 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 |  | 100,000,000.0 |  | 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 |  | 225,000,000.0 |  | 225,000,000.0
Maximum [Member] | Errors And Omissions [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Actuarial range value |  |  | 5,300,000 |  | 5,300,000 |  | 5,300,000
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 |  | 100,000,000.0 |  | 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 |  | 225,000,000.0 |  | 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 |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  | $ 400,000,000.0
Unconsolidated Investments in Enterprises [Member] | Minimum [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Ownership interest |  |  | 1.00% |  | 1.00% |  | 1.00%
Unconsolidated Investments in Enterprises [Member] | Maximum [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Ownership interest |  |  | 50.00% |  | 50.00% |  | 50.00%
M&T Insurance Agency [Member] |  |  |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |  |  |
Aggregate amount of maximum earnout obligations related to acquisitions | $ 22,500,000 |  |  |  |  |  |
Ownership interest | 100.00% |  |  |  |  |  |
Cash consideration | $ 170,000,000 |  |  |  |  |  |

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