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Business Combinations and Discontinued Operations - Additional information (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
Number
Sep. 30, 2020
USD ($)
Increase in income tax receivable $ 16,391 $ 28,837
Pediatric Orthopedic Multi Location Urgent Care Cardiology Neurology And Maternal Fetal Medicine Practice [Member]    
Business acquisition total consideration 24,600  
Business acquisition consideration paid in cash 19,600  
Business combination consideration identifiable as current and long term liabilities 5,000  
Goodwill 19,300  
Other intangible assets 1,800  
Fixed assets $ 3,500  
Pediatric Orthopedic Practice [Member]    
Number of other pediatric orthopedic practice acquired | Number 1  
Multi Location Pediatric Urgent Care Practice [Member]    
Number of other multi location pediatric urgent care practice acquired | Number 1  
Pediatric Cardiology Practice [Member]    
Number of other pediatric cardiology practice acquired | Number 1  
Pediatric Neurology Practice [Member]    
Number of other pediatric neurology practices acquired | Number 1  
Maternal Fetal Medicine Practice [Member]    
Number of other maternal fetal medicine practices acquired | Number 1  
North American Partners In Anesthesia [Member]    
Increase decrease in valuation allowance deferred tax assets $ 37,000  
Increase in income tax receivable 24,000  
Tax adjustments, sttlements and unusual provisions 9,000  
Increase in deferred tax assets 17,000  
Anesthesiology Services Medical Group [Member]    
Incremental loss on sale, net 19,000  
Radiology Services Medical Group [Member]    
Incremental loss on sale, net $ 3,300