Condensed Consolidating Financial Information - Cash Flow, Restricted Cash Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 62,540	$ 33,065	$ 29,563
Restricted cash included in prepaid expenses and other assets	75		303
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	62,615	33,118	29,866	$ 33,854
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash included in prepaid expenses and other assets	75		303
ION Geophysical Corporation
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	47,328		9,153
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	47,403	8,479	9,456	14,085
ION Geophysical Corporation | Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash included in prepaid expenses and other assets	75		303
The Guarantors
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	20		62
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	20	26	62	47
The Guarantors | Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash included in prepaid expenses and other assets	0		0
All Other Subsidiaries
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	15,192		20,348
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	15,192	$ 24,613	20,348	$ 19,722
All Other Subsidiaries | Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash included in prepaid expenses and other assets	$ 0		$ 0