Description of Business and Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands | Aug. 03, 2015Store | May. 27, 2015USD ($)$ / sharesshares | Feb. 28, 2015USD ($)$ / sharesshares | Oct. 31, 2014$ / sharesshares | Aug. 02, 2015USD ($)Store$ / sharesshares | Aug. 03, 2014USD ($) | Aug. 02, 2015USD ($)StoreSegment$ / sharesshares | Aug. 03, 2014USD ($) | Feb. 01, 2015$ / sharesshares |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Number of operating segments | Segment | | | | | | | 1 | | |
Number of reportable segments | Segment | | | | | | | 1 | | |
Number of new stores opened | Store | | | | | | | 4 | | |
Operating income | $ | | | | | $ 26,767 | $ 16,747 | $ 62,515 | $ 44,978 | |
Increase in authorized share amendment description | | | | | | | In October 2014, we amended and restated our certificate of incorporation to increase our authorized share count to 450,000,000 shares of stock, including 400,000,000 shares of common stock and 50,000,000 shares of preferred stock, each with a par value $0.01 per share and to split our common stock 224.9835679 for 1. | | |
Increased authorized shares | | | | 450,000,000 | | | | | |
Common stock, shares authorized | | | | 400,000,000 | 400,000,000 | | 400,000,000 | | 400,000,000 |
Common stock, par value | $ / shares | | | | $ 0.01 | $ 0.01 | | $ 0.01 | | $ 0.01 |
Stock split ratio | | | | 224.9835679 | | | | | |
Preferred stock, shares authorized | | | | 50,000,000 | 50,000,000 | | 50,000,000 | | 50,000,000 |
Preferred stock, par value | $ / shares | | | | $ 0.01 | | | | | |
Common stock, shares issued | | | | | 41,122,534 | | 41,122,534 | | 40,217,640 |
Deferred financing costs net | $ | | | | | $ 3,138 | | $ 3,138 | | |
Common Stock [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Common stock exercised | | | | | | | 904,894 | | |
United States and Canada [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Number of stores opened | Store | | | | | 76 | | 76 | | |
Farmingdale, New York [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Revenue | $ | | | | | | | $ 110 | 4,328 | |
Operating income | $ | | | | | | | $ 380 | 698 | |
Bethesda, Maryland [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Revenue | $ | | | | | | | | 5,231 | |
Operating income | $ | | | | | | | | 865 | |
Edina (Minneapolis), Minnesota [Member] | Subsequent Event [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Number of new stores opened | Store | 1 | | | | | | | | |
IPO [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Common stock issued | | | | 6,764,705 | | | | | |
Common stock price per share | $ / shares | | | | $ 16 | | | | | |
Follow-on Offering [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Common stock price per share | $ / shares | | $ 31.50 | $ 29.50 | | | | | | |
Common stock, shares issued | | 9,775,000 | 7,590,000 | | | | | | |
Common stock exercised | | 853,155 | 300,151 | | | | | | |
Weighted average exercise price of exercised options | $ / shares | | $ 4.46 | $ 4.49 | | | | | | |
Proceeds from the exercise of options | $ | | $ 3,809 | $ 1,346 | | | | | | |
Follow-on Offering [Member] | Common Stock [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Common stock exercised | | 604,743 | | | | | | | |
Follow-on Offering [Member] | Treasury Stock at Cost [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Common stock exercised | | 248,412 | | | | | | | |
Follow-on Offering [Member] | Director [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Percentage of outstanding common stock owned | | | | | 1.10% | | 1.10% | | |
Over-Allotment Option [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Common stock, shares issued | | 1,275,000 | 990,000 | | | | | | |
Oak Hill Capital Management LLC [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Percentage of outstanding common stock owned | | | | | 40.10% | | 40.10% | | |
Reimbursement expenses | $ | | | | | $ 17 | 7 | $ 31 | 34 | |
Oak Hill Capital Management LLC [Member] | Director [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Board members compensation | $ | | | | | $ 0 | $ 59 | $ 39 | $ 118 | |
Public [Member] | Follow-on Offering [Member] | | | | | | | | | |
Description Of Business And Basis Of Presentation [Line Items] | | | | | | | | | |
Percentage of outstanding common stock owned | | | | | 58.80% | | 58.80% | | |