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Debt (Detail) | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 USD ($) quarter | Dec. 31, 2012 USD ($) | Sep. 30, 2013 Domestic Line of Credit [Member] USD ($) | Dec. 31, 2012 Domestic Line of Credit [Member] USD ($) | Sep. 30, 2013 China Facility [Member] USD ($) | Sep. 30, 2012 China Facility [Member] USD ($) | Jun. 28, 2013 China Facility [Member] USD ($) | Jun. 28, 2013 China Facility [Member] CNY | Dec. 31, 2012 China Facility [Member] USD ($) | Sep. 30, 2013 Standby Letters of Credit [Member] USD ($) | Dec. 31, 2012 Standby Letters of Credit [Member] USD ($) | Jun. 30, 2011 Amount Available for Increase Upon Approval of Lender [Member] USD ($) | Jun. 30, 2011 Amended Amount [Member] USD ($) | Jun. 30, 2011 Minimum [Member] | Jun. 30, 2011 Maximum [Member] | Jun. 28, 2013 People's Bank of China Base Rate [Member] China Facility [Member]
Line of credit, maximum borrowing capacity |  |  |  |  |  |  | $ 5,690,000 | 35,000,000 |  |  |  | $ 25,000,000 | $ 15,000,000 |  |  |
Basis spread on variable rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% | 3.75% | 125.00%
Line of credit, amount outstanding | 0 | 0 |  |  | 1,626,000 |  |  |  | 0 |  |  |  |  |  |  |
Maximum funded deb to EBITA ratio , debt | 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum funded to debt to EBITDA ratio, EBITDA | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Quarters (in quarters) | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual capital expenditure limit | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum tangible net worth | 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net income | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of capital issuances | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, amount outstanding |  |  | 6,871,000 | 7,432,000 | 0 |  |  |  | 0 | 762,000 | 1,112,000 |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End (as a percent) |  |  |  |  | 7.00% |  |  |  | 7.00% |  |  |  |  |  |  |
Line of credit, remaining borrowing capacity |  |  | 8,129,000 | 7,568,000 |  |  |  |  |  | 3,302,000 | 4,429,000 |  |  |  |  |
Line of credit, commitment fee percentage |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid |  |  |  |  | $ 29,000 | $ 74,000 |  |  |  |  |  |  |  |  |  |

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