Selected Quarterly Financial Information - Summarizes Selected Quarterly Financial Information (Detail) - USD ($) |
3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2017 |
Sep. 30, 2017 |
Jul. 01, 2017 |
Apr. 01, 2017 |
Dec. 31, 2016 |
Oct. 01, 2016 |
Jul. 02, 2016 |
Apr. 02, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Sales | $ 171,318,000 | $ 149,636,000 | $ 151,114,000 | $ 152,396,000 | $ 154,068,000 | $ 155,099,000 | $ 164,426,000 | $ 159,530,000 | $ 624,464,000 | $ 633,123,000 | $ 692,279,000 |
| Gross Profit (sales less cost of products sold) | 32,153,000 | 32,493,000 | 34,150,000 | 38,317,000 | 36,486,000 | 38,663,000 | 44,835,000 | 39,483,000 | 137,113,000 | 159,467,000 | 187,942,000 |
| Impairment Loss | 16,237,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 16,237,000 | 0 | 0 |
| (Loss) Income Before Income Taxes | (9,715,000) | 8,646,000 | 10,569,000 | 15,491,000 | 14,296,000 | 16,422,000 | 21,555,000 | 16,512,000 | |||
| Net (Loss) Income | $ (5,653,000) | $ 6,060,000 | $ 7,685,000 | $ 11,587,000 | $ 9,885,000 | $ 12,074,000 | $ 14,980,000 | $ 11,485,000 | $ 19,679,000 | $ 48,424,000 | $ 66,974,000 |
| Basic earnings (loss) per share (in usd per share) | $ (0.20) | $ 0.21 | $ 0.27 | $ 0.40 | $ 0.34 | $ 0.42 | $ 0.51 | $ 0.39 | $ 0.69 | $ 1.66 | $ 2.29 |
| Diluted earnings (loss) per share (in usd per share) | $ (0.20) | $ 0.21 | $ 0.26 | $ 0.38 | $ 0.33 | $ 0.41 | $ 0.50 | $ 0.38 | $ 0.67 | $ 1.61 | $ 2.22 |
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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