Summary of Stock-Based Compensation Expense and Associated Tax Benefit Recognized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Apr. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation costs	$ 1,766		$ 1,779
Portion capitalized as property and equipment	(39)	[1]	(30)	[1]
Stock-based compensation expense recognized	1,727		1,749
Tax benefit recognized from stock-based compensation awards	$ 29		$ 619

[1] We capitalize the portion of stock-based compensation costs related to our design, construction, facilities and legal departments that are directly attributable to our store development projects, such as the design and construction of a new store and the remodeling and expansion of our existing stores. Capitalized stock-based compensation cost attributable to our store development projects is included in "Property and equipment, net" in the Consolidated Balance Sheets.