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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)
 12 Months Ended 228 Months Ended
Dec. 23, 2020
USD ($)
Dec. 31, 2020
USD ($)
ft²
Employee
Entity
LetterOfCredit
Company
Dec. 31, 2019
USD ($)
Entity
Dec. 31, 2018
USD ($)
Entity
Dec. 31, 2020
USD ($)
ft²
Entity
LetterOfCredit
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Accrued Liability   $ 50,000,000.0     $ 50,000,000.0
Cash Paid   $ 398,300,000      
Number of square feet | ft²   360,000     360,000
Number of employees will accommodate at new facility | Employee   2,000      
Total rent expense   $ 154,000,000.0 $ 148,100,000 $ 140,000,000.0  
Number of companies acquired | Entity   135 116 112 583
Aggregate amount of maximum earnout obligations related to acquisitions   $ 1,128,100,000 $ 982,900,000    
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet   592,200,000 $ 565,000,000.0    
Aggregate amount of earnout obligation expected settlement in cash or stock at option   493,700,000     $ 493,700,000
Aggregate amount of earnout obligation expected settlement in cash   $ 98,500,000     $ 98,500,000
Ownership interest   50.00%     50.00%
Debt   $ 19,600,000     $ 19,600,000
Liabilities recorded on self-insurance   17,500,000     $ 17,500,000
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   1     1
Collateral [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Number of letters of credit issued | LetterOfCredit   1     1
Self-Insurance Deductibles [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Number of letters of credit issued | LetterOfCredit   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
Errors And Omissions [Member] | Up to $4.5 Million [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Insurance claims, amount retained   $ 4,500,000      
Errors And Omissions [Member] | Up to $10 Million [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Insurance claims, amount retained   10,000,000.0      
Insurance claim arise during ordinary course of business   10,000,000.0     $ 10,000,000.0
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   27,000,000.0      
Letter of Credit [Member] | Security Deposit [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   500,000     500,000
Letter of Credit [Member] | Collateral [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   1,000,000.0     1,000,000.0
Letter of Credit [Member] | Self-Insurance Deductibles [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   9,400,000     9,400,000
Liabilities recorded on self-insurance   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   $ 7,500,000     7,500,000
Minimum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Number of micro-captive insurance companies organized or managed | Company   100      
Minimum [Member] | Errors And Omissions [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Actuarial range value   $ 2,600,000     2,600,000
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   10,000,000.0     10,000,000.0
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
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   $ 240,000,000.0     $ 240,000,000.0
Minimum [Member] | Unconsolidated Investments in Enterprises [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest   1.00%     1.00%
Maximum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest   50.00%     50.00%
Maximum [Member] | Errors And Omissions [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Actuarial range value   $ 6,400,000     $ 6,400,000
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
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   240,000,000.0     240,000,000.0
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   $ 350,000,000.0     $ 350,000,000.0
Maximum [Member] | Unconsolidated Investments in Enterprises [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest   50.00%     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   $ 25,500,000     $ 25,500,000
Tax Increment Financing [Member] | Minimum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Property tax credit expect to receive   60,000,000.0     60,000,000.0
Tax Increment Financing [Member] | Maximum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Property tax credit expect to receive   90,000,000.0     90,000,000.0
Ashton Tiffany, LLC (AT) [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Accrued Liability   48,200,000     48,200,000
Cash Paid   48,300,000      
Ashton Tiffany, LLC (AT) [Member] | Common Stock [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Accrued Liability   $ 48,200,000     $ 48,200,000
The Bollington Wilson Group [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Percentage of equity interests acquired 100.00%        
Cash Paid $ 330,000,000.0