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Environmental Commitments and Contingencies - Additional Information 1 (Detail) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2010
Key West Florida [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Period of regulatory inactivity   17 years
Costs to resolve liability $ 50,000  
Key West Florida [Member] | Maximum [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Costs to resolve liability 8,000  
Pensacola Florida [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Costs to resolve liability 5,000  
Winter Haven Florida [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Environmental remediation expense 443,000  
Additional remediation costs 100,000  
Corrective measures cost 1,000,000  
Winter Haven Florida [Member] | Minimum [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Remedial action time period 2 years  
Winter Haven Florida [Member] | Maximum [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Remedial action time period 3 years  
Salisbury Maryland [Member]
   
Environmental Commitments And Contingencies [Line Items]    
Monitoring well remaining maximum cost $ 5,000