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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Income Taxes [Line Items]      
Net deferred tax assets $ 41,120 $ 63,924  
Net deferred tax assets, non-current 26,406 58,681  
Unrecognized tax benefit that, if recognized, would impact the effective tax rate 3,861 3,874  
Recognized benefit/(expense) in interest and penalties (541) 1,334 437
Accrued amounts for payment of interest and penalties 3,070 2,529  
Unrecognized tax benefits, lower bound 0    
Unrecognized tax benefits, upper bound 6,211    
U.S. Federal
      
Income Taxes [Line Items]      
Net deferred tax assets 26,555 48,762  
Net operating loss carryforwards 6,165    
U.S. Federal | Minimum
      
Income Taxes [Line Items]      
Expiration date 2016    
U.S. Federal | Maximum
      
Income Taxes [Line Items]      
Expiration date 2032    
State and Local Jurisdiction
      
Income Taxes [Line Items]      
Net deferred tax assets 11,436 12,374  
Foreign Jurisdictions
      
Income Taxes [Line Items]      
Net deferred tax assets 3,129 2,788  
Net operating loss carryforwards 14,983    
Undistributed earnings $ 166,798