Condensed Consolidating Financial Information - Cash Flow, Restricted Cash Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 51,056	$ 33,065	$ 27,894
Restricted cash included in prepaid expenses and other assets	2,326		303
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	53,382	33,118	28,197	$ 33,854
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash included in prepaid expenses and other assets	2,326		303
ION Geophysical Corporation
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	32,106		7,153
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	34,432	8,479	7,456	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	2,326		303
The Guarantors
Restricted Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	31		45
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	31	26	45	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	18,919		20,696
Total cash, cash equivalents, and restricted cash shown in statements of cash flows	18,919	$ 24,613	20,696	$ 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