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Share-Based Compensation - Share-based Compensation Expense (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 2.4us-gaap_AllocatedShareBasedCompensationExpense $ 1.3us-gaap_AllocatedShareBasedCompensationExpense
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 0.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 0.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Performance-Based RSUs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 1.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 0.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Time-Based RSUs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 0.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 $ 0.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember