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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 28, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 000-51211    
Entity Registrant Name GTT Communications, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-2096338    
Entity Address, Address Line One 7900 Tysons One Place    
Entity Address, Address Line Two Suite 1450    
Entity Address, City or Town McLean    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 22102    
City Area Code 703    
Local Phone Number 442-5500    
Title of 12(b) Security Common stock, par value $.0001 per share    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 804,979,505
Entity Common Stock, Shares Outstanding   56,737,341  
Documents Incorporated by Reference
Portions of our definitive proxy statement for the 2020 Annual Meeting of Stockholders, to be filed within 120 days after the end of the fiscal year covered by this Form 10-K, are incorporated by reference into Part III hereof. 
    
Entity Central Index Key 0001315255    
Current Fiscal Year End Date --12-31    
Amendment Flag 2019    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus false    
Trading Symbol GTT