XML 78 R66.htm IDEA: XBRL DOCUMENT v3.7.0.1
Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)
 3 Months Ended 183 Months Ended
Mar. 31, 2017
USD ($)
ft²
Entity
Employees
LetterOfCredit
Mar. 31, 2016
Entity
Mar. 31, 2017
USD ($)
ft²
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 40 32 432
Aggregate amount of maximum earnout obligations related to acquisitions $ 565,300,000    
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet $ 268,300,000    
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 $ 5,000,000   $ 5,000,000
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
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 $ 9,300,000   9,300,000
Debt $ 12,300,000   12,300,000
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    
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 $ 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 $ 7,200,000   $ 7,200,000