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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 63,777 $ 10,081 $ 13,919 $ 20,788
Accounts receivable, net 8,480 14,246    
Accounts payable 2,797 6,203    
Variable rate long-term debt - (including current maturities) 18,480 24,185    
Fair value [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 63,777 10,081    
Accounts receivable, net 8,480 14,246    
Accounts payable 2,797 6,203    
Variable rate long-term debt - (including current maturities) 18,480 24,185    
Carrying amount [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 63,777 10,081    
Accounts receivable, net 8,480 14,246    
Accounts payable 2,797 6,203    
Variable rate long-term debt - (including current maturities) $ 18,480 $ 24,185