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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 246 Months Ended
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Jun. 30, 2022 USD ($) ft² Entity LetterOfCredit | Jun. 30, 2021 Entity | Jun. 30, 2022 USD ($) ft² Entity LetterOfCredit Employee | Jun. 30, 2021 Entity | Jun. 30, 2022 USD ($) ft² LetterOfCredit Entity
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |
Number of square feet | ft² | 360,000 |  | 360,000 |  | 360,000
Number of employees will accommodate at new facility | Employee |  |  | 2,000 |  |
Number of companies acquired | Entity | 30 | 26 | 50 | 48 | 635
Aggregate amount of maximum earnout obligations related to acquisitions |  |  | $ 1,753,200,000 |  |
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet |  |  | 848,700,000 |  |
Aggregate amount of earnout obligation expected settlement in cash or stock at option | $ 588,300,000 |  | 588,300,000 |  | $ 588,300,000
Aggregate amount of earnout obligation expected settlement in cash | 260,400,000 |  | 260,400,000 |  | 260,400,000
Debt | $ 9,400,000 |  | 9,400,000 |  | $ 9,400,000
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 |  | 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 | 8 |  | 8 |  | 8
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 |  |  | 20,000,000.0 |  |
Errors And Omissions [Member] | Up to $27.0 Million [Member] |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |
Insurance claims, amount retained |  |  | 10,000,000.0 |  |
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 | 900,000 |  | 900,000 |  | 900,000
Letter of Credit [Member] | Self-Insurance Deductibles [Member] |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |
Liabilities recorded on self-insurance | 17,600,000 |  | 17,600,000 |  | 17,600,000
Letter of Credit [Member] | Rent-A-Captive Facility [Member] |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |
Debt | 2,500,000 |  | 2,500,000 |  | 2,500,000
Minimum [Member] | Errors And Omissions [Member] |  |  |  |  |
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items] |  |  |  |  |
Actuarial range value | 4,100,000 |  | 4,100,000 |  | 4,100,000
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 | 5,700,000 |  | 5,700,000 |  | 5,700,000
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 | $ 365,000,000.0 |  | $ 365,000,000.0 |  | $ 365,000,000.0
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%

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