Sale of Subsidiaries Sale of Subsidiaries (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Aug. 31, 2018	Apr. 30, 2019
Seismic Asia Pacific Pty Ltd
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of subsidiary		$ 660
Proceeds in cash from sale of subsidiary		240
Proceeds in note receivable from sale of subsidiary		420
Working capital adjustment		$ 114
Mitcham Seismic Eurasia LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of subsidiary	$ 1,200
Interest rate on payments due from sale of subsidiary	9.00%
Loss on sale subsidiary	$ 4,900
Cumulative translation loss	$ 5,400

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Interest Rate On Proceeds Due On Installments Of Principal And Interest

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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- Definition

Amount of foreign currency translation gain (loss) in the disposal group, including discontinued operation, recognized in the statement of income as a result of the sale or complete or substantially complete liquidation of an investment in a foreign entity.

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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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.

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- Definition

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

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