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Trade Accounts Receivable, Net (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade accounts receivable $ 3,803 $ 4,274
Sales returns and allowances (161) (166)
Trade and other accounts receivable, gross 3,642 4,108
Allowance for uncollectible accounts (35) (35)
Trade accounts receivable, net $ 3,607 $ 4,073