Information Relative to Contracts in Progress (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013
Contracts [Line Items]
Costs incurred to date on uncompleted contracts	$ 816
Estimated earnings recognized to date on these contracts	268
Costs incurred and Estimated earnings of uncompleted contracts	1,084
Billings to date	(1,017)
Costs and estimated earnings in excess of billings, net	67
Costs and estimated earnings in excess of billings	108
Billings in excess of costs and estimated earnings	(41)
Costs and estimated earnings in excess of billings, net	$ 67