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 |