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Shareholders' Interest (Narrative) (Detail) - Entity [Domain] - 2015 Executive Long-Term Incentive Plan [Member] - $ / shares
Jul. 27, 2015
Jun. 24, 2015
Restricted Stock [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Common stock shares authorized 1,253,831  
Common Class A [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Common stock shares authorized   4,000,000
Common stock par value per share   $ 0.001