v2.4.0.8
Document And Entity Information
3 Months Ended
Mar. 31, 2015
Apr. 27, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2015  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2015  
Entity Registrant Name NATIONAL INSTRUMENTS CORP /DE/  
Entity Central Index Key 0000935494  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   128,151,551