Organization and Summary of Significant Accounting Policies - Balances Greater Than Ten Percent of Accounts Receivable (Parenthetical) (Detail)

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Organization and Summary of Significant Accounting Policies - Balances Greater Than Ten Percent of Accounts Receivable (Parenthetical) (Detail) (Minimum [Member])	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Minimum [Member]
Revenue, Major Customer [Line Items]
Percentage representing accounts receivable	Less than 10% of accounts receivables	Less than 10% of accounts receivables	Less than 10% of accounts receivables