Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.20.4
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Segment
Dec. 31, 2018
USD ($)
Segment
Summary Of Significant Accounting Policies [Line Items]      
Restricted Cash $ 13,847    
General liability claim per occurrence, cap 500 $ 500 $ 250
Aggregate annual cap per policy year 0 0 4,750
Pre-funding claims and covers claims annual cap 5,000 5,000 5,000
Medical claim per occurrence, cap 250 250 $ 250
Insurance Reserves $ 9,034 $ 11,577  
Minimum Percentage for Tax position measure as largest amount of benefit 50.00%    
Reportable operating segments | Segment 2 2 2
U.S. Operating Segment      
Summary Of Significant Accounting Policies [Line Items]      
Number of reporting units | Segment 20    
International Operating Segment      
Summary Of Significant Accounting Policies [Line Items]      
Number of reporting units | Segment 7    
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 20.00%    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Equity method investment, ownership percentage 50.00%    
Cost method investment, ownership Percentage 20.00%    
Pre-funding claims and covers claims per occurrence     $ 250