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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 05, 2020
Jun. 28, 2019
Document And Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 0-25426    
Entity Registrant Name NATIONAL INSTRUMENTS CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-1871327    
Entity Address, Address Line One 11500 North MoPac Expressway      
Entity Address, City or Town Austin,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 78759    
City Area Code 512    
Local Phone Number 683-0100    
Title of 12(g) Security Common Stock, $0.01 par value    
Trading Symbol NATI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 3,059,614,367
Entity Common Stock, Shares Outstanding   130,760,076  
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Entity Central Index Key 0000935494    
Current Fiscal Year End Date --12-31    
Documents Incorporated by Reference
Part III incorporates certain information by reference from the definitive proxy statement to be filed by the registrant for its Annual Meeting of Stockholders to be held on May 5, 2020 (the “Proxy Statement”).