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Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Oct. 01, 2017
Mar. 01, 2013
Dec. 31, 2020
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Sep. 30, 2020
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Jun. 30, 2020
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Mar. 31, 2020
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Dec. 31, 2019
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Sep. 30, 2019
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Jun. 30, 2019
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Mar. 31, 2019
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Dec. 31, 2020
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Dec. 31, 2019
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Dec. 31, 2018
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Summary Of Significant Accounting Policies [Line Items]                          
Number of operating segments | segment                     3    
Net service revenues     $ 195,996,000 $ 193,987,000 $ 184,576,000 $ 190,216,000 $ 192,376,000 $ 168,993,000 $ 148,915,000 $ 138,507,000 $ 764,775,000 $ 648,791,000 $ 516,647,000
Contract with customer liability     $ 1,800,000       400,000       $ 1,800,000 400,000  
Percent of fair value of reporting unit excess of carrying value     90.00%               90.00%    
Goodwill impairment charge                     $ 0 0 0
Goodwill     $ 469,072,000       275,368,000       469,072,000 275,368,000 135,442,000
Impairment of finite-lived intangible assets                     0 0 0
Intangibles, net of accumulated amortization     71,549,000       57,079,000       71,549,000 57,079,000  
Deductible component of workers' compensation                     400,000    
Letters of credit secure compensation program     9,000,000.0       10,000,000.0       9,000,000.0 10,000,000.0  
Accrued workers’ compensation insurance     13,759,000       14,143,000       13,759,000 14,143,000  
Workers' compensation insurance recovery receivables     $ 1,860,000       $ 1,989,000       $ 1,860,000 1,989,000  
Interest income received                       700,000 2,300,000
Number of stock incentive plans | item                     1    
Stock-based compensation expense                     $ 6,000,000.0 5,800,000 4,100,000
Stock Options [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Stock-based compensation expense                     $ 2,000,000.0 $ 2,500,000 $ 2,000,000.0
Number of stock options included in calculation | shares     506,000       648,000       506,000 648,000 683,000
Number of dilutive shares outstanding | shares                     304,000 346,000 247,000
Restricted Stock [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Stock-based compensation expense                     $ 4,000,000.0 $ 3,300,000 $ 2,100,000
Number of dilutive shares outstanding | shares                     57,000 86,000 88,000
Shares of restricted stock awards included in calculation | shares                     154,000 149,000 149,000
Minimum [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Leases termination and renewal option                     1 year    
Intangible assets, estimated useful lives                     1 year    
Minimum [Member] | Customer and Referral Relationships [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Intangible assets, estimated useful lives                     5 years    
Maximum [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Leases termination and renewal option                     5 years    
Intangible assets, estimated useful lives                     25 years    
Maximum [Member] | Customer and Referral Relationships [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Intangible assets, estimated useful lives                     10 years    
General and Administrative Expenses [Member] | Frisco Corporate Headquarter [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Operating lease asset, impairment                     $ 1,000,000.0    
Accounting Standards Update 2014-09 [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Net service revenues                         $ 18,000,000.0
Accounts receivable, allowance for doubtful accounts     $ 1,000,000.0       $ 1,000,000.0       $ 1,000,000.0 $ 1,000,000.0  
Accounting Standards Update 2014-09 [Member] | Subsequent Changes [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Net service revenues                       3,000,000.0 $ 1,300,000
Accounting Standards Update 2016-13 [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Change in accounting principle, accounting standards update, adopted     true               true    
Change in accounting principle, accounting standards update, immaterial effect     true               true    
Accounting Standards Update 2017-04 [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Change in accounting principle, accounting standards update, adopted     true               true    
Change in accounting principle, accounting standards update, immaterial effect     true               true    
Accounting Standards Update 2018-15 [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Change in accounting principle, accounting standards update, adopted     true               true    
Change in accounting principle, accounting standards update, immaterial effect     true               true    
Accounting Standards Update 2019-12 [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Change in accounting principle, accounting standards update, adopted     true               true    
Change in accounting principle, accounting standards update, immaterial effect     false               false    
Change in accounting principle, accounting standards update, adoption date     Dec. 15, 2020               Dec. 15, 2020    
2013 Home Health Business [Member]                          
Summary Of Significant Accounting Policies [Line Items]                          
Equity ownership percentage sold in joint venture 10.00% 90.00%                      
Settlement expense in discontinued operation                       $ 600,000