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Consolidated Valuation and Qualifying Accounts and Reserves (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Allowance for Doubtful Accounts
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Year | $ 289 | $ 311 | $ 421 |
| Charges (Reversals) to Cost or Expenses | 241 | 74 | (80) |
| Deductions | (226) | (96) | (30) |
| Balance at End of Year | 304 | 289 | 311 |
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Allowance for Sales Returns
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Year | 110 | 110 | 110 |
| Charges (Reversals) to Cost or Expenses | |||
| Deductions | |||
| Balance at End of Year | 110 | 110 | 110 |
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Allowance for tax valuation
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance at Beginning of Year | 33,784 | 34,250 | 30,177 |
| Charges (Reversals) to Cost or Expenses | (443) | (466) | 4,073 |
| Deductions | |||
| Balance at End of Year | $ 33,341 | $ 33,784 | $ 34,250 |