XML 69 R57.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock-Based Compensation - Additional Information (Detail)
$ in Millions
3 Months Ended
Apr. 01, 2017
USD ($)
Anniversaries
Installment
Apr. 02, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options exercise prices as percentage of the market value on the date of the grant 100.00%  
Compensation expenses for stock options $ 0.3 $ 0.2
Restricted Stock [Member] | LTIP [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Portion of restricted stock award vesting on anniversary 0.333%  
Eligible age of officer for restricted stock award 55 years  
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense related to stock $ 26.1  
Weighted-average recognition period for unrecognized compensation expense related to stock (years) 1 year 10 months 24 days  
Number of anniversaries of grant date upon which restricted stock units vest | Anniversaries 3  
Installments in which restricted stock units vest and are converted to common stock | Installment 3  
Compensation expense $ 5.0 4.9
Restricted Stock Units [Member] | AIP [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Eligible age of officer for restricted stock award 55 years  
Amount of annual incentive award payment participant can elect to defer 50.00%  
Additional common stock units for election of deferred annual incentive award, percentage 25.00%  
Restricted Stock And Restricted Stock Units [Member] | AIP and LTIP [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense related to stock $ 1.9  
Weighted-average recognition period for unrecognized compensation expense related to stock (years) 2 years 2 months 12 days  
Compensation expense $ 4.3 $ 2.2
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options vesting period 3 years  
Stock options term, years 10 years  
Unrecognized compensation expense related to stock $ 1.3  
Weighted-average recognition period for unrecognized compensation expense related to stock (years) 1 year 9 months 18 days