Annual report pursuant to Section 13 and 15(d)

Operations and Summary of Significant Accounting Policies - Additional Information (Details)

v3.22.0.1
Operations and Summary of Significant Accounting Policies - Additional Information (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]            
Number of reportable segments | segment       2    
Cash       $ 22,308,000 $ 25,246,000  
Cash equivalents       15,008,000 15,008,000  
Average monthly revenue adjustments       662,000    
Average monthly revenue       $ 138,536,000    
Average monthly revenue adjustments as a percentage of monthly revenue       0.50%    
Property and Equipment            
Capitalized computer software, net       $ 8,140,000 7,455,000  
Capitalized computer software, amortization       2,394,000 2,053,000 $ 1,714,000
Long-lived asset impairment $ 0 $ 0 $ 0      
Goodwill impairment $ 0 $ 0 $ 0      
Goodwill accumulated impairment       25,686,000    
Goodwill tax deductible       187,608,000    
Amortization       14,328,000 13,489,000 10,183,000
Intangible assets, estimated future amortization            
2022       16,018,000    
2023       15,779,000    
2024       15,655,000    
2025       15,557,000    
2026       15,366,000    
Liability insurance coverage       100,000    
Self-insurance retention workers' compensation       500,000    
Self insurance reserve       65,649,000 68,647,000  
Self insurance reserves, current       21,172,000 17,994,000  
Self insurance reserve, noncurrent       44,477,000 50,653,000  
Insurance settlements receivable       28,667,000 35,088,000  
Net income allocated to participating securities       $ 737,000 385,000 $ 945,000
Share-based awards, vesting period       3 years    
Other operating expenses       $ 434,000 $ 1,560,000  
Employee Stock Option            
Intangible assets, estimated future amortization            
Share-based awards, vesting period       3 years    
Performance Shares            
Intangible assets, estimated future amortization            
Share-based awards, vesting period       3 years    
Minimum            
Property and Equipment            
Capitalized computer software, amortization period       3 years    
Estimated useful lives       20 years    
Maximum            
Property and Equipment            
Capitalized computer software, amortization period       5 years    
Estimated useful lives       1 year    
Buildings and improvements | Minimum            
Property and Equipment            
Property and equipment, useful life       30 years    
Buildings and improvements | Maximum            
Property and Equipment            
Property and equipment, useful life       40 years    
Equipment | Minimum            
Property and Equipment            
Property and equipment, useful life       3 years    
Equipment | Maximum            
Property and Equipment            
Property and equipment, useful life       10 years    
Computer software            
Property and Equipment            
Property and equipment, useful life       5 years