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Valuation and Qualifying Accounts (Detail) (USD $)
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12 Months Ended | |||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Allowance for Doubtful Accounts
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| Valuation and Qualifying Accounts Disclosure [Line Items] | ||||||
| Balance at Beginning of Period | $ 311,000 | $ 387,000 | $ 656,000 | |||
| Adjustments | 115,000 | 23,000 | (160,000) | |||
| Deductions | (148,000) | (99,000) | (109,000) | |||
| Balance at End of Period | 278,000 | 311,000 | 387,000 | |||
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Allowance for Obsolete or Slow-Moving Inventory
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| Valuation and Qualifying Accounts Disclosure [Line Items] | ||||||
| Balance at Beginning of Period | 1,439,000 | 1,401,000 | 2,009,000 | |||
| Adjustments | 251,000 | 224,000 | 179,000 | |||
| Deductions | (236,000) | (186,000) | (787,000) | |||
| Balance at End of Period | 1,454,000 | 1,439,000 | 1,401,000 | |||
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Valuation Allowance of Deferred Tax Assets
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| Valuation and Qualifying Accounts Disclosure [Line Items] | ||||||
| Balance at Beginning of Period | 1,376,000 | 1,213,000 | 1,198,000 | |||
| Additions | 163,000 | 15,000 | ||||
| Deductions | (7,000) | [1] | ||||
| Balance at End of Period | $ 1,369,000 | $ 1,376,000 | $ 1,213,000 | |||
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