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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to EVERTEC, Inc.	$ 20,052	$ 20,089	$ 43,074	$ 43,118
Less: non-forfeitable dividends on restricted stock	0	3	0	3
Net income available to EVERTEC, Inc.’s common shareholders	$ 20,052	$ 20,086	$ 43,074	$ 43,115
Weighted average common shares outstanding (in shares)	72,637,733	72,508,852	72,524,228	72,572,157
Weighted average potential dilutive common shares (in shares)	1,751,393	565,739	1,381,462	515,230
Weighted average common shares outstanding - assuming dilution (in shares)	74,389,126	73,074,591	73,905,690	73,087,387
Net income per common share - basic (in usd per share)	$ 0.28	$ 0.28	$ 0.59	$ 0.59
Net income per common share - diluted (in usd per share)	$ 0.27	$ 0.27	$ 0.58	$ 0.59