Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 09, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Trading Symbol	CRK
Entity Registrant Name	COMSTOCK RESOURCES INC
Entity Central Index Key	0000023194
Current Fiscal Year End Date	--12-31
Entity File Number	001-03262
Entity Tax Identification Number	941667468
Entity Address, Address Line One	5300 Town and Country Blvd.
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Frisco
Entity Address, State or Province	Texas
Entity Address, Postal Zip Code	75034
City Area Code	972
Local Phone Number	668-8800
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		184,770,759