The Company - Additional Information (Detail)	1 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Aug. 01, 2015 USD ($) State Store	Aug. 02, 2014 USD ($)	Jul. 31, 2015 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of retail stores | Store		67
Number of outlet stores | Store		15
Number of states | State		27
Payment for convertible hedge transactions		$ 68,250,000	$ 73,325,000
Aggregate proceeds from sale of warrants		30,390,000	40,390,000
Offering costs		2,382,000	$ 5,385,000
Convertible Senior Notes Due 2020 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Debt instrument, principal amount		$ 300,000,000
Payment for convertible hedge transactions	$ 68,250,000
Aggregate proceeds from sale of warrants	30,390,000
Cash proceeds from convertible debt issuance and convertible hedge transactions, net of initial purchasers discounts and commissions and offering costs	256,000,000
Offering costs	6,100,000
Private Placement [Member] | Convertible Senior Notes Due 2020 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Debt instrument, principal amount	$ 250,000,000
Debt instrument, interest rate	0.00%
Exercise of Over Allotment Option in Private Placement [Member] | Convertible Senior Notes Due 2020 [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Debt instrument, principal amount				$ 50,000,000