Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plans - Amendments to Restricted Stock and SARs - Additional Information (Detail)

v3.10.0.1
Stock-Based Compensation Plans - Amendments to Restricted Stock and SARs - Additional Information (Detail) - shares
 6 Months Ended
Oct. 30, 2013
Oct. 01, 2013
Jun. 30, 2018
Deferred stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee termination age 67 years    
DSU settlement to common stock percentage 20.00%    
DSU settlement into actual stock issued term 5 years    
Percentage of shares of deferred stock units settled in the event of death or termination after reaching age 67 100.00%    
Restricted Stock Sales Restriction [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Sales restriction lapse percentage for restricted stock 20.00%    
Employee termination age 67 years    
Sales restriction period for restricted stock 5 years    
Percentage of shares of stock released from resale restriction upon consummation of change of control 100.00%    
Percentage of shares of restricted released from resale restriction in the event of death or termination after reaching age 67 100.00%    
Number of original shares subject to resale restriction   3,689,326  
Number of shares remain subject to sales restriction     732,020