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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)
 3 Months Ended 9 Months Ended 189 Months Ended
Sep. 30, 2017
USD ($)
ft²
Entity
Sep. 30, 2016
Entity
Sep. 30, 2017
USD ($)
ft²
Entity
Employees
LetterOfCredit
Sep. 30, 2016
Entity
Sep. 30, 2017
USD ($)
ft²
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 | 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 31 27 89 77 450
Aggregate amount of maximum earnout obligations related to acquisitions     $ 563,900,000    
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet     $ 274,300,000    
Tax Increment Financing [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Property tax credit expect to receive period     15 years    
Letter of Credit [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt $ 4,200,000   $ 4,200,000   $ 4,200,000
Number of letters of credit issued | LetterOfCredit     1    
Letter of Credit [Member] | Security Deposit [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Debt 500,000   $ 500,000   500,000
Number of letters of credit issued | LetterOfCredit     1    
Letter of Credit [Member] | Self-Insurance Deductibles [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Liabilities recorded on self-insurance 9,700,000   $ 9,700,000   9,700,000
Debt 12,400,000   $ 12,400,000   12,400,000
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   $ 6,300,000
Number of letters of credit issued | LetterOfCredit     7    
Minimum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest 1.00%   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   $ 60,000,000
Maximum [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Ownership interest 50.00%   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 $ 80,000,000   $ 80,000,000   $ 80,000,000
Outstanding Purchase Obligations Related to New Corporate Headquarters Building [Member]          
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]          
Contractual Obligations, Payments Due by Period, Total $ 700,000   $ 700,000   $ 700,000