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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Jan. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]            
Goodwill $ 3,997,000   $ 3,997,000   $ 4,155,000 $ 2,500,000
Goodwill impairment         3,000,000  
Aggregate amortization expense $ 369,000,000 $ 413,000,000 $ 1,100 $ 1,300    
Maximum [Member]            
Finite-Lived Intangible Assets [Line Items]            
Useful life of intangible assets     15 years      
Minimum [Member]            
Finite-Lived Intangible Assets [Line Items]            
Useful life of intangible assets     3 years      
Equipment Leasing [Member]            
Finite-Lived Intangible Assets [Line Items]            
Impairment of intangible assets         $ 600,000  
Klein Associates Inc. [Member]            
Finite-Lived Intangible Assets [Line Items]            
Goodwill           1,504,000
Other intangible assets           $ 2,400,000