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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 19, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Entity Registrant Name KLDiscovery Inc.    
Entity Central Index Key 0001752474    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Small Business true    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   42,529,017  
Entity Public Float     $ 233,450,000
Entity File Number 001-38789    
Entity Tax Identification Number 61-1898603    
Entity Address, Address Line One 8201 Greensboro Drive    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town McLean    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 22102    
City Area Code 703    
Local Phone Number 288-3380    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Incorporation, State or Country Code DE    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement relating to its annual meeting of stockholders to be held in 2020 (the “2020 Annual Meeting”), to be filed with the Securities and Exchange Commission (the “SEC”) within 120 days after the end of the fiscal year to which this Annual Report on Form 10-K relates, are incorporated herein by reference where indicated. Except with respect to information specifically incorporated by reference in this Annual Report on Form 10-K, such proxy statement is not deemed to be filed as part hereof.