Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Schedule of Nonvested Restricted Stock Units Activity (Detail)

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Stockholders' Equity - Schedule of Nonvested Restricted Stock Units Activity (Detail) (Restricted Stock [Member], USD $)
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested Shares at beginning of period 552,980 721,365 363,078
Awarded Shares 146,411 375,317 855,143
Vested Shares (205,928) (348,346) (381,955)
Forfeited/expired/cancelled Shares (46,995) (195,356) (114,901)
Nonvested Shares at end of period 446,468 552,980 721,365
Nonvested Weighted average grant date fair value at beginning of period $ 10.51 $ 10.46 $ 8.00
Awarded Weighted average grant date fair value $ 11.15 $ 8.62 $ 10.10
Vested Weighted average grant date fair value $ 12.61 $ 8.73 $ 7.53
Forfeited/expired/cancelled Weighted average grant date fair value $ 9.93 $ 9.87 $ 9.73
Nonvested Weighted average grant date fair value at ending of period $ 9.81 $ 10.51 $ 10.46