v2.4.0.8
Document and Entity Information
9 Months Ended
Sep. 30, 2014
Document and Entity Information  
Entity Registrant Name TGC INDUSTRIES INC
Entity Central Index Key 0000799165
Document Type S-4/A
Pre-Effective Amendment Number 1
Document Period End Date Sep. 30, 2014
Amendment Flag false
Entity Filer Category Accelerated Filer