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. 21, 2020	Feb. 20, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income attributable to EVERTEC, Inc.’s common stockholders			$ 15,484		$ 27,058		$ 37,695	$ 53,702
Weighted average common shares outstanding (in shares)			71,864,499		72,128,795		71,938,574	72,252,974
Weighted average potential dilutive common shares (in shares)			909,866		1,171,758		1,080,645	1,396,959
Weighted average common shares outstanding - assuming dilution (in shares)			72,774,365		73,300,553		73,019,219	73,649,933
Net income per common share - basic (in usd per share)			$ 0.22		$ 0.38		$ 0.52	$ 0.74
Net income per common share - diluted (in usd per share)			0.21		0.37		$ 0.52	$ 0.73
Cash dividends declared (in usd per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05