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Business Combinations and Discontinued Operations - Additional information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
Number
Mar. 31, 2020
USD ($)
Increase in income tax receivable $ 18,501 $ 32,955
Pediatric Orthopedic Practice And Multi Location Pediatric Urgent Care Practice [Member]    
Number of other pediatric orthopedic practice acquired | Number 1  
Number of other multi location pediatric urgent care practice acquired | Number 1  
Business acquisition total consideration $ 6,000  
Goodwill 5,000  
Other intangible assets 900  
Fixed assets 100  
North American Partners In Anesthesia [Member]    
Increase decrease in valuation allowance deferred tax assets 65,000  
Increase in income tax receivable 18,000  
Tax adjustments, sttlements and unusual provisions 7,000  
Increase in deferred tax assets 13,000  
Anesthesiology Services Medical Group [Member]    
Incremental loss on sale, net $ 12,300