Business and Asset Acquisitions - Schedule of Consideration Payable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Current	$ 3,127	$ 10,293	$ 2,556
Long-Term	16,225	16,426	9,020
TAV Gaming
Business Acquisition [Line Items]
Current	491	490	194
Long-Term	3,470	3,497	1,232
Abraham
Business Acquisition [Line Items]
Current	26	55	207
Long-Term	0	0	0
Fair Share Gaming
Business Acquisition [Line Items]
Current	1,177	1,057	1,027
Long-Term	370	899	0
Family Amusement
Business Acquisition [Line Items]
Current	394	293	357
Long-Term	2,835	2,815	3,011
Skyhigh
Business Acquisition [Line Items]
Current	647	763	550
Long-Term	4,158	3,948	3,971
G3
Business Acquisition [Line Items]
Current	312	2,952	221
Long-Term	127	154	806
Grand River
Business Acquisition [Line Items]
Current	0	2,304	0
Long-Term	5,265	5,113	0
IGS
Business Acquisition [Line Items]
Current	80	2,379	0
Long-Term	$ 0	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_TAVGamingInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_AbrahamGamingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_FairShareGamingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_FamilyAmusementinc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_SkyhighGamingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_G3GamingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_GrandRiverJackpotMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=acel_IllinoisGamingSystemsLLCIGSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: