Investment in Affiliates - Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income statement data:
Revenues	$ 30,018	$ 33,813	$ 59,907	$ 70,136
Gross profit	5,596	4,349	11,533	9,663
Operating income	1,900	690	4,278	1,869
Net income (loss)	$ 1,004	$ (2,854)	$ 3,527	$ (3,090)