Acquisition of AdvantageMS - Details of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 7,574	$ 7,574
Intangible assets, Accumulated Amortization	(2,670)	(1,023)
Intangible assets, Net	4,904us-gaap_FiniteLivedIntangibleAssetsNet	6,551us-gaap_FiniteLivedIntangibleAssetsNet
Data update technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	3,680	3,680
Intangible assets, Accumulated Amortization	(1,188)	(452)
Intangible assets, Net	2,492	3,228
Estimated economic lives	3 years 4 months 24 days	4 years 4 months 24 days
Database [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	2,570	2,570
Intangible assets, Accumulated Amortization	(1,037)	(394)
Intangible assets, Net	1,533	2,176
Estimated economic lives	2 years 3 months 18 days	3 years 4 months 24 days
Customer relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	1,020	1,020
Intangible assets, Accumulated Amortization	(274)	(104)
Intangible assets, Net	746	916
Estimated economic lives	4 years 3 months 18 days	5 years 4 months 24 days
Software [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	304	304
Intangible assets, Accumulated Amortization	(171)	(73)
Intangible assets, Net	133	231
Estimated economic lives	1 year 3 months 18 days	2 years 3 months 18 days
Advantage Management Solutions, Inc. [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	7,380
Intangible assets, Accumulated Amortization	(2,558)
Intangible assets, Net	4,822
Advantage Management Solutions, Inc. [Member] \| Data update technology [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	3,680
Intangible assets, Accumulated Amortization	(1,188)
Intangible assets, Net	2,492
Estimated economic lives	3 years 4 months 24 days
Advantage Management Solutions, Inc. [Member] \| Database [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	2,570
Intangible assets, Accumulated Amortization	(1,037)
Intangible assets, Net	1,533
Estimated economic lives	2 years 3 months 18 days
Advantage Management Solutions, Inc. [Member] \| Customer relationships [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	1,020
Intangible assets, Accumulated Amortization	(274)
Intangible assets, Net	746
Estimated economic lives	4 years 3 months 18 days
Advantage Management Solutions, Inc. [Member] \| Software [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	110
Intangible assets, Accumulated Amortization	(59)
Intangible assets, Net	$ 51
Estimated economic lives	1 year 3 months 18 days

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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