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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jul. 12, 2014
May 31, 2013
Chief Executive Officer
Jul. 12, 2014
Deferred Stock
Jul. 12, 2014
Deferred Stock
Non Employee Directors
Jul. 12, 2014
Deferred Stock
Non Employee Directors
Jul. 12, 2014
Deferred Stock
Minimum
May 31, 2013
Restricted Stock Award
Chief Executive Officer
Jul. 12, 2014
Deferred Stock Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Deferred shares distributed     18,330          
Retainers conversion into deferred shares     130.00%          
Vesting period     1 year   1 year 2 years    
Aggregate shares converted     36,425 60,300        
Restricted stock award   $ 1.3            
Restricted shares issued   58,500            
Restricted shares per share             $ 22.25  
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP 8.1             2.5
Expected weighted-average period to recognize compensation cost (years) 1 year 3 months 18 days             1 year 7 months 28 days
Award vesting tax windfall               $ 0.6