Seismic Equipment Lease Pool and Property and Equipment - Additional Information (Detail) - USD ($)	12 Months Ended
Jan. 31, 2019	Jan. 31, 2018
Property, Plant and Equipment [Abstract]
Impairment charges related to long-lived assets	$ 0	$ 0

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration