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Performance-Contingent Restricted Stock Awards (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 15, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at vesting $ 553  
Fiscal Year Vested 2017 | 2015 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at vesting 392  
Income tax expense related to share-based payments (3,099)  
Fair value at vesting $ 6,316  
Fiscal Year Vested 2017 | TSR Modifier | 2015 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares increase/(decrease) (378,219)  
Fiscal Year Vested 2017 | ROIC Modifier | 2015 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares increase/(decrease) (49,272)  
Fiscal Year Vested 2016 | 2014 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at vesting   $ 441
Income tax expense related to share-based payments   (3,090)
Fair value at vesting   $ 7,173
Fiscal Year Vested 2016 | TSR Modifier | 2014 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares increase/(decrease)   (248,872)
Fiscal Year Vested 2016 | ROIC Modifier | 2014 Award Granted    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares increase/(decrease)   (13,637)