Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 31, 2014	Jan. 31, 2014
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Gross	$ 52,374	$ 53,977
Accumulated Amortization	(43,451)	(41,322)
Finite-lived intangible assets, Net	8,923	12,655
Total intangible assets, Gross	52,574	54,177
Accumulated Amortization	(43,651)	(41,322)
Total intangible assets, net	8,923	12,855
Customer Contracts [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted average remaining life (years)	6 years
Finite-lived intangible assets, Gross	31,656	32,593
Accumulated Amortization	(24,172)	(22,344)
Finite-lived intangible assets, Net	7,484	10,249
Non-Compete Agreements [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted average remaining life (years)	3 months 18 days
Finite-lived intangible assets, Gross	2,628	2,772
Accumulated Amortization	(2,593)	(2,632)
Finite-lived intangible assets, Net	35	140
Completed Technology [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted average remaining life (years)	5 years 1 month 6 days
Finite-lived intangible assets, Gross	10,969	11,461
Accumulated Amortization	(9,565)	(9,195)
Finite-lived intangible assets, Net	1,404	2,266
Trademarks, Patents and Other [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Weighted average remaining life (years)	0 years
Finite-lived intangible assets, Gross	7,121	7,151
Accumulated Amortization	(7,121)	(7,151)
Trade Names [Member]
Finite Lived And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross	200	200
Accumulated Amortization	(200)
Indefinite-lived intangible assets, Net		$ 200