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Business Combinations - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Oct. 31, 2011	Oct. 31, 2011
Business Acquisition [Line Items]
Gain on conversion of equity method investment to controlling interest	$ 1,519	$ 1,519
Fair value of net assets of acquired business		8,900
Total consideration for acquisition of one privately-held company	$ 1,890	$ 1,890

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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- Definition

The fair value of assets acquired in noncash investing or financing activities.

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