Document and Entity Information - USD ($)	9 Months Ended
	Sep. 30, 2018	Nov. 02, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	Air Transport Services Group, Inc.
Entity Central Index Key	0000894081
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		59,080,387
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,260,495,219