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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)
 12 Months Ended 192 Months Ended
Dec. 22, 2018
USD ($)
Employee
Dec. 31, 2018
USD ($)
ft²
Entity
LetterOfCredit
Employees
Dec. 31, 2017
USD ($)
Entity
Dec. 31, 2016
USD ($)
Entity
Dec. 31, 2018
USD ($)
ft²
Entity
LetterOfCredit
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Number of square feet | ft²   360,000     360,000
Number of employees will accommodate at new facility | Employees   2,000      
Lease abandonment charges     $ 13,200,000    
Total rent expense   $ 140,000,000 $ 137,700,000 $ 134,200,000  
Number of companies acquired | Entity   112 108 101 507
Aggregate amount of maximum earnout obligations related to acquisitions   $ 558,100,000 $ 567,900,000    
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet   $ 258,800,000 $ 264,200,000    
Ownership interest   50.00%     50.00%
Debt   $ 19,900,000     $ 19,900,000
Liabilities recorded on self-insurance   $ 15,800,000     15,800,000
Definitive Agreement [Member] | Stackhouse Poland Group Limited [Member] | United Kingdom, Pounds          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Cash consideration $ 350,000,000        
Percentage of interest acquired in acquired entity 100.00%        
Number of employees will accommodate at new facility | Employee 500        
Tax Increment Financing [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Property tax credit expect to receive period   15 years      
Economic development for growing economy tax credit   $ 11,800,000     11,800,000
Letter of Credit [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   $ 1,300,000     $ 1,300,000
Number of letters of credit issued | LetterOfCredit   1     1
Letter of Credit [Member] | Security Deposit [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   $ 500,000     $ 500,000
Number of letters of credit issued | LetterOfCredit   1     1
Letter of Credit [Member] | Self-Insurance Deductibles [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   $ 10,200,000     $ 10,200,000
Liabilities recorded on self-insurance   $ 15,800,000     $ 15,800,000
Number of letters of credit issued | LetterOfCredit   2     2
Letter of Credit [Member] | Rent-A-Captive Facility [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt   $ 6,300,000     $ 6,300,000
Number of letters of credit issued | LetterOfCredit   7     7
Minimum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest   1.00%     1.00%
Minimum [Member] | Tax Increment Financing [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Property tax credit expect to receive   $ 60,000,000     $ 60,000,000
Maximum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest   50.00%     50.00%
Maximum [Member] | Tax Increment Financing [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Property tax credit expect to receive   $ 90,000,000     $ 90,000,000