Intangible Assets and Goodwill - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 54,470	$ 54,470
Intangible assets, Accumulated Amortization	(15,187)	(6,970)
Intangible assets, Net	39,283	47,500
Existing technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	3,880	3,880
Intangible assets, Accumulated Amortization	(2,733)	(1,957)
Intangible assets, Net	$ 1,147	$ 1,923
Intangible assets, Remaining Useful Life	1 year 7 months 6 days	2 years 7 months 6 days
Database [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 4,939	$ 4,939
Intangible assets, Accumulated Amortization	(3,291)	(2,103)
Intangible assets, Net	$ 1,648	$ 2,836
Intangible assets, Remaining Useful Life	2 years 6 months	3 years
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 33,643	$ 33,643
Intangible assets, Accumulated Amortization	(5,245)	(1,693)
Intangible assets, Net	$ 28,398	$ 31,950
Intangible assets, Remaining Useful Life	8 years 6 months	9 years 4 months 24 days
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 10,867	$ 10,867
Intangible assets, Accumulated Amortization	(3,481)	(1,106)
Intangible assets, Net	$ 7,386	$ 9,761
Intangible assets, Remaining Useful Life	3 years 2 months 12 days	4 years 2 months 12 days
Brand [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 1,141	$ 1,141
Intangible assets, Accumulated Amortization	(437)	(111)
Intangible assets, Net	$ 704	$ 1,030
Intangible assets, Remaining Useful Life	2 years 2 months 12 days	3 years 2 months 12 days