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Cover Page - shares
 6 Months Ended
Jun. 30, 2019
Jul. 29, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 1-31398  
Entity Registrant Name NATURAL GAS SERVICES GROUP INC  
Entity Incorporation, State or Country Code CO  
Entity Tax Identification Number 75-2811855  
Entity Address, Address Line One 404 Veterans Airpark Ln., Ste 300  
Entity Address, City or Town Midland  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 79705  
City Area Code 432  
Local Phone Number 262-2700  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   13,226,971
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol NGS  
Security Exchange Name NYSE  
Amendment Flag false  
Entity Central Index Key 0001084991  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2019  
Current Fiscal Year End Date --12-31