Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail)

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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 2 years 3 months 18 days  
Finite-life intangible assets, Gross $ 50,419 $ 50,051
Accumulated Amortization (48,137) (47,448)
Finite-life intangible assets, Net $ 2,282 2,603
Customer Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 2 years 3 months 18 days  
Finite-life intangible assets, Gross $ 30,260 30,056
Accumulated Amortization (28,488) (28,019)
Finite-life intangible assets, Net $ 1,772 2,037
Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 2 years 4 months 24 days  
Finite-life intangible assets, Gross $ 2,406 2,374
Accumulated Amortization (2,390) (2,356)
Finite-life intangible assets, Net $ 16 18
Completed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 1 year  
Finite-life intangible assets, Gross $ 10,620 10,496
Accumulated Amortization (10,173) (9,997)
Finite-life intangible assets, Net $ 447 499
Trademarks, Patents and Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 3 years  
Finite-life intangible assets, Gross $ 7,133 7,125
Accumulated Amortization (7,086) (7,076)
Finite-life intangible assets, Net $ 47 $ 49