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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 11, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Registrant Name Mednax, Inc.    
Entity Central Index Key 0000893949    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   86,472,585  
Entity Voluntary Filers No    
Title of 12(b) Security Common Stock    
Trading Symbol MD    
Security Exchange Name NYSE    
Entity File Number 001-12111    
Entity Incorporation, State or Country Code FL    
Entity Tax Identification Number 26-3667538    
Entity Address, Address Line One 1301 Concord Terrace    
Entity Address, City or Town Sunrise    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33323    
City Area Code 954    
Local Phone Number 384-0175    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1,894,617,377
ICFR Auditor Attestation Flag true    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Hallandale Beach, Florida    
Auditor Firm ID 238