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Commitments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Commitments And Contingencies [Line Items]      
Rent Expense $ 939 $ 727 $ 550
Hannibal, Missouri
      
Schedule Of Commitments And Contingencies [Line Items]      
Long Term Ground Leases Expiration Period   20 years  
Marsing
      
Schedule Of Commitments And Contingencies [Line Items]      
Long Term Ground Leases Expiration Period   25 years  
Minimum | Axis, Alabama
      
Schedule Of Commitments And Contingencies [Line Items]      
Long Term Ground Leases Expiration Period 20 years    
Maximum | Axis, Alabama
      
Schedule Of Commitments And Contingencies [Line Items]      
Long Term Ground Leases Expiration Period 35 years