Acquisition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Jan. 31, 2016
Business Acquisition [Line Items]
Business Acquisition, Name of Acquired Entity			Bayou Perma-Pipe Canada, Ltd
Business Acquisition, Description of Acquired Entity			a coating and insulation company in Camrose, Alberta
Business Acquisition, Date of Acquisition Agreement			Feb. 04, 2016
Equity Method Investment, Ownership Percentage					49.00%
Cash			$ 7,587
Loan payable			2,000
Purchase consideration to third party			9,587
Fair Value of 49% Previously Held Equity Interest			7,492
Total purchase consideration			17,079
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 2,915		2,915
Property and equipment	13,124		13,124
Goodwill	2,476		2,476		$ 0
Business combination, net working capital	406		406
Business Combination, other assets (liabilities) net Acquired and Liabilities Assumed, Noncurrent Liabilities	(1,842)		(1,842)
Net assets acquired	17,079		17,079
Business Acquisition, Transaction Costs	200		200
Loss on consolidation of joint venture	$ 0	$ 0	$ 1,620	$ 0