Net Income Per Common Share - Reconciliation of Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to EVERTEC, Inc.	$ 20,089	$ 20,235	$ 43,118	$ 39,383
Less: non-forfeitable dividends on restricted stock	3	3	3	15
Net income available to EVERTEC, Inc.’s common shareholders	$ 20,086	$ 20,232	$ 43,115	$ 39,368
Weighted average common shares outstanding (in shares)	72,508,852	74,706,042	72,572,157	74,826,946
Weighted average potential dilutive common shares (in shares)	565,739	313,443	515,230	131,180
Weighted average common shares outstanding - assuming dilution (in shares)	73,074,591	75,019,485	73,087,387	74,958,126
Net income per common share - basic (usd per share)	$ 0.28	$ 0.27	$ 0.59	$ 0.53
Net income per common share - diluted (usd per share)	$ 0.27	$ 0.27	$ 0.59	$ 0.53