Property, Plant and Equipment - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Property Plant And Equipment Useful Life And Values [Abstract]
Cash purchase of office building	$ 1,955,000
Depreciation expense		142,000	136,000	407,000	385,000
Cost of maintenance & repair		83,000	92,000	204,000	263,000
Rent expense included in the selling, general and administrative expenses of continuing operations		56,000	101,000	125,000	319,000
Rent expense incurred at project sites and included in cost of revenues		$ 866,000	$ 1,465,000	$ 2,665,000	$ 5,719,000