Net Income Per Common Share - Reconciliation of Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended						9 Months Ended
	Jul. 24, 2020	Apr. 21, 2020	Feb. 20, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income attributable to EVERTEC, Inc.’s common stockholders				$ 34,463			$ 24,754			$ 72,158	$ 78,456
Less: non-forfeitable dividends on restricted stock				0			2			0	2
Net income available to EVERTEC, Inc.’s common shareholders				$ 34,463			$ 24,752			$ 72,158	$ 78,454
Weighted average common shares outstanding (in shares)				71,886,439			71,942,403			71,921,069	72,148,312
Weighted average potential dilutive common shares (in shares)				1,115,341			1,372,301			1,128,748	1,382,553
Weighted average common shares outstanding - assuming dilution (in shares)				73,001,780			73,314,704			73,049,817	73,530,865
Net income per common share - basic (in usd per share)				$ 0.48			$ 0.34			$ 1.00	$ 1.09
Net income per common share - diluted (in usd per share)				0.47			0.34			$ 0.99	$ 1.07
Cash dividends declared (in usd per share)	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05	$ 0.05