Intangible Assets - Details of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 54,470	$ 54,470
Intangible assets, Accumulated amortization	(19,182)	(15,187)
Intangible assets, Net	35,288	39,283
Existing technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	3,880	3,880
Intangible assets, Accumulated amortization	(3,121)	(2,733)
Intangible assets, Net	$ 759	$ 1,147
Intangible assets, Remaining useful life	1 year 2 months 12 days	1 year 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	(3,809)	(3,291)
Intangible assets, Net	$ 1,130	$ 1,648
Intangible assets, Remaining useful life	2 years 4 months 24 days	2 years 6 months
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 33,643	$ 33,643
Intangible assets, Accumulated amortization	(7,008)	(5,245)
Intangible assets, Net	$ 26,635	$ 28,398
Intangible assets, Remaining useful life	8 years	8 years 6 months
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 10,867	$ 10,867
Intangible assets, Accumulated amortization	(4,646)	(3,481)
Intangible assets, Net	$ 6,221	$ 7,386
Intangible assets, Remaining useful life	2 years 8 months 12 days	3 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	(598)	(437)
Intangible assets, Net	$ 543	$ 704
Intangible assets, Remaining useful life	1 year 8 months 12 days	2 years 2 months 12 days