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Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation and Qualifying Accounts: (USD $)
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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 Sales Returns [Member]
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| Balance | $ (3,124,000) | $ (3,142,000) | $ (2,627,000) |
| Charged to Costs and Other Expenses | (48,548,000) | (56,372,000) | (55,570,000) |
| Deductions | 49,591,000 | 56,390,000 | 55,055,000 |
| Balance | (2,081,000) | (3,124,000) | (3,142,000) |
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Allowance for Doubtful Accounts [Member]
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| Balance | (767,000) | (73,000) | (91,000) |
| Charged to Costs and Other Expenses | (358,000) | (1,103,000) | (324,000) |
| Deductions | 1,003,000 | 409,000 | 342,000 |
| Balance | (122,000) | (767,000) | (73,000) |
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Inventory Valuation Reserve [Member]
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| Balance | (3,277,000) | (1,093,000) | (1,286,000) |
| Charged to Costs and Other Expenses | 564,000 | (3,121,000) | (359,000) |
| Deductions | 1,572,000 | 937,000 | 552,000 |
| Balance | (1,141,000) | (3,277,000) | (1,093,000) |
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Valuation Allowance of Deferred Tax Assets [Member]
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| Balance | (51,843,000) | (47,717,000) | (47,388,000) |
| Charged to Costs and Other Expenses | (8,340,000) | (4,126,000) | (3,322,000) |
| Charged to Other Accounts | 2,993,000 | ||
| Balance | $ (60,183,000) | $ (51,843,000) | $ (47,717,000) |