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Nature of business (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Nov. 26, 2018
Numerator for loss per common share calculation:      
Net loss available to Hemisphere Media Group $ (1,686) $ (7,559)  
Denominator for loss per common share calculation:      
Weighted-average common shares, basic 39,031 38,955  
Effect of dilutive securities      
Weighted-average common shares, diluted 39,031 38,955  
Loss per share available to Hemisphere Media Group      
Basic (in dollars per share) $ (0.04) $ (0.19)  
Diluted (in dollars per share) $ (0.04) $ (0.19)  
Shares excluded from the computation of diluted loss per common share 1,100 2,100  
Outstanding awards excluded from computation of diluted loss per share 500 200  
Snap Media      
Nature of business      
Voting interest acquired (as a percent)     75.00%