Summary of Activity in Stock Option Plan (Detail) (USD $)	6 Months Ended
	Aug. 03, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Outstanding at February 2, 2013	5,027,665
Options granted	787,190
Options exercised
Options forfeited	(169,176)
Options expired	(144,600)
Outstanding at August 3, 2013	5,501,079
Options vested and expected to vest at August 3, 2013	4,893,222
Exercisable at August 3, 2013	1,928,226
Outstanding at February 2, 2013	$ 10.00
Options granted, Weighted-Average Exercise Price	$ 10.00
Options exercised, Weighted-Average Exercise Price
Options forfeited, Weighted-Average Exercise Price	$ 10.00
Options expired, Weighted-Average Exercise Price	$ 10.00
Outstanding at August 3, 2013	$ 10.00
Options vested and expected to vest at August 3, 2013	$ 10.00
Exercisable at August 3, 2013	$ 10.00
Outstanding at August 3, 2013, Weighted Average Remaining Contractual Term	4 years 8 months 12 days
Options vested and expected to vest at August 3, 2013, Weighted Average Remaining Contractual Term	4 years 8 months 12 days
Exercisable at August 3, 2013, Weighted Average Remaining Contractual Term	2 years 2 months 12 days