Net Income Per Common Share - Reconciliation of Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 20, 2020	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to EVERTEC, Inc.’s common stockholders		$ 22,211	$ 26,644
Less: non-forfeitable dividends on restricted stock		6	6
Net income available to EVERTEC, Inc.’s common shareholders		$ 22,205	$ 26,638
Weighted average common shares outstanding (in shares)		72,012,648	72,378,532
Weighted average potential dilutive common shares (in shares)		1,280,357	1,391,534
Weighted average common shares outstanding - assuming dilution (in shares)		73,293,005	73,770,066
Net income per common share - basic (in usd per share)		$ 0.31	$ 0.37
Net income per common share - diluted (in usd per share)		0.30	0.36
Cash dividends declared (in usd per share)	$ 0.05	$ 0.05	$ 0.05