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Investments - Schedule of Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Short-Term $ 6,457 $ 6,584
Long-Term 57,511 47,593
Municipal Debt Securities [Member]
   
Schedule of Investments [Line Items]    
Short-Term 5,492 6,088
Long-Term 34,495 27,563
Federal Home Loan Securities [Member]
   
Schedule of Investments [Line Items]    
Short-Term      
Long-Term 22,520 18,569
Certificates of Deposit [Member]
   
Schedule of Investments [Line Items]    
Short-Term 965 496
Long-Term $ 496 $ 1,461