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Major Customers and Foreign Sales - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Major Customers [Line Items] |  |  |
Sales outside Country, percentage | 32.00% | 37.00% | 38.00%
Europe [Member] |  |  |
Major Customers [Line Items] |  |  |
Sales outside Country, percentage | 6.00% |  |
Long lived assets located outside Country | $ 19.6 |  |
Outside United States [Member] |  |  |
Major Customers [Line Items] |  |  |
Long lived assets located outside Country | $ 35.4 | $ 34.8 |
Asia [Member] |  |  |
Major Customers [Line Items] |  |  |
Sales outside Country, percentage | 12.00% |  |
Long lived assets located outside Country | $ 13.6 |  |
Net Sales [Member] | Customer Concentration Risk [Member] |  |  |
Major Customers [Line Items] |  |  |
Major customer | 10.00% | 10.00% | 10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Major Customers [Line Items] |  |  |
Major customer | 10.00% | 10.00% | 10.00%

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