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Summary of Quarterly Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2013	May 31, 2012	May 31, 2011
Quarterly Financial Information [Line Items]
Total revenues	$ 56,007	$ 51,055	$ 50,737	$ 49,729	$ 48,546	$ 44,912	$ 44,891	$ 45,697	$ 207,528	$ 184,046	$ 172,683
Gross margin	28,381	27,313	27,306	26,494	23,899	22,892	22,657	22,977	109,494	92,425	87,792
Net income	$ 7,031	$ 6,652	$ 6,793	$ 6,714	$ 6,028	$ 5,244	$ 5,237	$ 6,004	$ 27,190	$ 22,513	$ 22,839
Basic net income per share	$ 0.29	$ 0.28	$ 0.29	$ 0.28	$ 0.26	$ 0.22	$ 0.22	$ 0.26	$ 1.14	$ 0.96	$ 0.99
Diluted net income per share	$ 0.29	$ 0.27	$ 0.28	$ 0.28	$ 0.25	$ 0.22	$ 0.22	$ 0.25	$ 1.12	$ 0.94	$ 0.96

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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