Venezuela's Highly Inflationary Economy - Additional Information (Detail) (USD $)	3 Months Ended
	Aug. 31, 2014	Feb. 28, 2014	Aug. 31, 2013	May 31, 2014 SICAD-2	Mar. 31, 2014 SICAD-2	Mar. 31, 2014 SICAD-2 Minimum	Mar. 31, 2014 SICAD-2 Maximum	Aug. 31, 2014 Venezuela	May 31, 2014 Venezuela
Investment in Country with High Inflationary Economy [Line Items]
Percentage of consolidated revenues from small service location	1.00%
Recognized losses related to the Venezuelan currency	$ (181,000)	$ (1,900,000)	$ (390,000)	$ (2,100,000)
Foreign currency exchange rate					50	10	11.8
Net assets of Venezuelan subsidiary								$ 800,000	$ 700,000