Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	$ 4.3
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	0.8
Weighted average years expected to recognize compensation	1 year 9 months 18 days
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	1.5
Weighted average years expected to recognize compensation	1 year 9 months 18 days
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	$ 2.0
Weighted average years expected to recognize compensation	1 year 7 months 6 days