v3.19.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol MDRX  
Entity Registrant Name ALLSCRIPTS HEALTHCARE SOLUTIONS, INC.  
Entity Central Index Key 0001124804  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   162,366,195
Entity File Number 001-35547  
Entity Tax Identification Number 36-4392754  
Entity Address, Address Line One 222 Merchandise Mart  
Entity Address, Address Line Two Suite 2024  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60654  
City Area Code 800  
Local Phone Number 334-8534  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Security Exchange Name NASDAQ  
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false