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Summary of Stock Appreciation Right Activity (Detail) - Stock Appreciation Rights (SARs) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards outstanding at beginning of year, Shares 304,100    
Granted, Shares 0 0 0
Exercised, Shares (69,675)    
Forfeited or Expired, Shares (3,100)    
Awards outstanding at end of year, Shares 231,325 304,100  
Awards outstanding expected to vest, Shares 230,234    
Awards outstanding at end of year, Shares 184,363    
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 31.74    
Granted, Weighted Average Exercise Price 0    
Exercised, Weighted Average Exercise Price 28.53    
Forfeited or Expired, Weighted Average Exercise Price 32.80    
Awards outstanding at end of year, Weighted Average Exercise Price 32.69 $ 31.74  
Awards outstanding expected to vest, Weighted Average Exercise Price 32.69    
Awards exercisable at end of year, Weighted Average Exercise Price $ 32.47    
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 2 years 6 months 3 years 6 months  
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 2 years 6 months    
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 2 years 6 months    
Awards outstanding at beginning of year, Aggregate Intrinsic Value $ 0    
Awards outstanding at end of year, Aggregate Intrinsic Value 0 $ 0  
Awards outstanding expected to vest, Aggregate Intrinsic Value 0    
Awards exercisable at end of year, Aggregate Intrinsic Value $ 0