Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Maximum [Member]
Property, Plant and Equipment [Line Items]
Operating leases, non-cancelable term	1 year
Foreign Country [Member]
Property, Plant and Equipment [Line Items]
Office rental expense	$ 1,200,000	$ 1,200,000	$ 1,400,000
Seismic Equipment Lease Pool [Member] | Domestic Tax Authority [Member]
Property, Plant and Equipment [Line Items]
Lease expense incurred by the Company	$ 552,000	$ 831,000	$ 1,400,000