Share-Based Compensation - Unrecognized Share-based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	$ 9.5
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	2.5
Weighted average years expected to recognize compensation	2 years
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	2.1
Weighted average years expected to recognize compensation	2 years 3 months 18 days
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	4.5
Weighted average years expected to recognize compensation	2 years
Director Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense	$ 0.4
Weighted average years expected to recognize compensation	6 months