Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Decrease in other expenses due to one percent increase in discount rate	$ 0.2	$ 0.2
Increase in other expenses due to one percent decrease in discount rate	$ 0.2	$ 0.2

Sensitivity Analysis Of Fair Value, Contingent Consideration, Impact Of One Percent Decrease In Discount Rate On Other Expenses

No definition available.

Name:	acel_SensitivityAnalysisOfFairValueContingentConsiderationImpactOfOnePercentDecreaseInDiscountRateOnOtherExpenses
Namespace Prefix:	acel_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration