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Net Income Per Share - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Disclosure Net Income Loss Per Share Additional Information [Abstract]
Antidilutive securities excluded from computation of earnings per share, amount	531	1,946	674	1,959
Non-controlling interest adjustment to redemption value	$ (2,349)	$ 0	$ (1,881)	$ 0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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