Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Feb. 28, 2019
Jun. 30, 2018
Document And Entity Information [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description The registrant filed with the Securities and Exchange Commission an Annual Report on Form 10-K for the year ended December 31, 2018 on March 15, 2019, as amended by that certain Amendment No. 1 filed on May 10, 2019 (the Form 10-K). This Amendment No. 2 on Form 10-K/A is being filed solely to correct for missing conformed signatures on the Reports of the Company’s Independent Registered Public Accounting Firm under Item 8 of the Form 10-K and in the accompanying Exhibit 23.1 Consent of Independent Registered Public Accounting Firm to the Form 10-K. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by our principal executive officer and principal financial officer are being filed as exhibits to this Amendment No. 2 on Form 10-K/A. Except as expressly set forth in this Amendment No. 2, the Form 10-K has not been amended, updated or otherwise modified.    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol RNET    
Entity Registrant Name RigNet, Inc.    
Entity Central Index Key 0001162112    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   19,464,847  
Entity Public Float     $ 148.2