CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2021
Income Statement [Abstract]
Income taxes for unrealized gain on investment in convertible notes	$ (126)	$ 2,135

OCI, Convertible Notes, Investment, Gain (Loss), Tax

No definition available.

Name:	acel_OCIConvertibleNotesInvestmentGainLossTax
Namespace Prefix:	acel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration