Net Income Per Common Share - Reconciliation of Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended				6 Months Ended
	Apr. 22, 2021	Feb. 18, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income available to EVERTEC, Inc.’s common shareholders			$ 49,197		$ 15,484		$ 84,700	$ 37,695
Net income available to EVERTEC, Inc.’s common shareholders			$ 49,197		$ 15,484		$ 84,700	$ 37,695
Weighted average common shares outstanding (in shares)			72,127,847		71,864,499		72,139,125	71,938,574
Weighted average potential dilutive common shares (in shares)			703,519		909,866		577,825	1,080,645
Weighted average common shares outstanding - assuming dilution (in shares)			72,831,366		72,774,365		72,716,950	73,019,219
Net income per common share - basic (in usd per share)			$ 0.68		$ 0.22		$ 1.17	$ 0.52
Net income per common share - diluted (in usd per share)			0.68		0.21		$ 1.16	$ 0.52
Cash dividends declared (in usd per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05