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Business Segment, Geographic Area, Product and Significant Customer Information - Schedule of Capital Expenditures, Depreciation and Amortization Expense and Segment Assets by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures | $ 2,794 | $ 3,028 | $ 9,154 | $ 11,040 |  |
Depreciation and amortization | 4,245 | 3,640 | 12,715 | 10,197 |  |
Accounts receivable | 98,133 |  | 98,133 |  | 82,060 |
Inventory | 136,060 |  | 136,060 |  | 134,639 |
Total segment assets | 234,193 |  | 234,193 |  | 216,699 | 274,526
Advanced Manufacturing Capital Equipment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures | 1,893 | 2,102 | 6,599 | 6,741 |  |
Depreciation and amortization | 2,861 | 2,409 | 8,819 | 6,797 |  |
Accounts receivable | 14,645 |  | 14,645 |  | 9,644 |
Inventory | 107,935 |  | 107,935 |  | 108,397 |
Total segment assets | 122,580 |  | 122,580 |  | 118,041 |
Analytical Solutions Group [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures | 125 | 283 | 265 | 698 |  |
Depreciation and amortization | 319 | 248 | 923 | 715 |  |
Accounts receivable | 4,263 |  | 4,263 |  | 5,889 |
Inventory | 4,354 |  | 4,354 |  | 3,841 |
Total segment assets | 8,617 |  | 8,617 |  | 9,730 |
Europe Region Sales & Service Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures | 24 | 35 | 137 | 109 |  |
Depreciation and amortization | 86 | 102 | 260 | 305 |  |
Accounts receivable | 6,611 |  | 6,611 |  | 5,813 |
Inventory | 3,950 |  | 3,950 |  | 3,691 |
Total segment assets | 10,561 |  | 10,561 |  | 9,504 |
Asia Region Sales & Service Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures | 239 | 237 | 435 | 654 |  |
Depreciation and amortization | 294 | 537 | 876 | 1,330 |  |
Accounts receivable | 36,380 |  | 36,380 |  | 32,088 |
Inventory | 28,532 |  | 28,532 |  | 29,534 |
Total segment assets | 64,912 |  | 64,912 |  | 61,622 |
Corporate, Eliminations and Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures | 513 | 371 | 1,718 | 2,838 |  |
Depreciation and amortization | 685 | 344 | 1,837 | 1,050 |  |
Accounts receivable | 36,234 |  | 36,234 |  | 28,626 |
Inventory | (8,711) |  | (8,711) |  | (10,824) |
Total segment assets | $ 27,523 |  | $ 27,523 |  | $ 17,802 |

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