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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)
 3 Months Ended 24 Months Ended 195 Months Ended
Mar. 31, 2018
USD ($)
ft²
LetterOfCredit
Entity
Employees
Mar. 31, 2017
USD ($)
LetterOfCredit
Entity
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
ft²
LetterOfCredit
Entity
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      
Acquired property through lease area, sqft | ft² 306,000      
Acquired property through lease percentage of building 60.00%      
Operating lease commitment, expiration date Feb. 28, 2018      
Number of companies acquired | Entity 39 40   466
Aggregate amount of maximum earnout obligations related to acquisitions $ 571,000,000      
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet $ 270,900,000      
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 $ 11,000,000     $ 11,000,000
Letter of Credit [Member]        
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]        
Liabilities recorded on self-insurance $ 700,000     $ 700,000
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   $ 9,700,000    
Liabilities recorded on self-insurance   $ 13,600,000    
Number of letters of credit issued | LetterOfCredit   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%
Micro-captive operations, net earnings     $ 3,500,000  
Micro-captive operations, EBITDAC     $ 5,000,000  
Maximum [Member] | Tax Increment Financing [Member]        
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]        
Property tax credit expect to receive $ 80,000,000     $ 80,000,000