Legal Proceedings and Contingencies - Additional Information (Detail) (Australia And New Zealand Discontinued Operations [Member], USD $)	12 Months Ended
	Aug. 31, 2012	Dec. 31, 2009
Australia And New Zealand Discontinued Operations [Member]
Loss Contingencies [Line Items]
Cash	$ 100,000
Other net assets	800,000
Amount of proceeds in escrow	1,200,000	2,000,000
Escrowed payments received	775,000
Remaining escrowed payments	800,000
Number of equal installment payments release of escrow (in number of payments)	4
Amount of claim filed by the purchaser of Company's Lane cave	$ 901,000