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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | $ 2,107 | $ 2,794 | $ 9,362 | $ 9,154 |
Depreciation and amortization | 5,792 | 4,245 | 14,757 | 12,715 |
Accounts receivable | 106,290 |  | 106,290 |  | 116,744
Inventory | 153,930 |  | 153,930 |  | 142,727
Total segment assets | 260,220 |  | 260,220 |  | 259,471
Operating Segments [Member] | Advanced Manufacturing Capital Equipment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | 1,341 | 1,893 | 5,282 | 6,599 |
Depreciation and amortization | 4,393 | 2,861 | 10,816 | 8,819 |
Accounts receivable | 15,853 |  | 15,853 |  | 20,767
Inventory | 125,309 |  | 125,309 |  | 117,822
Total segment assets | 141,162 |  | 141,162 |  | 138,589
Operating Segments [Member] | Analytical Solutions Group [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | 21 | 125 | 1,823 | 265 |
Depreciation and amortization | 319 | 319 | 795 | 923 |
Accounts receivable | 4,843 |  | 4,843 |  | 5,603
Inventory | 4,638 |  | 4,638 |  | 4,391
Total segment assets | 9,481 |  | 9,481 |  | 9,994
Operating Segments [Member] | Europe Region Sales & Service Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | 60 | 24 | 87 | 137 |
Depreciation and amortization | 85 | 86 | 260 | 260 |
Accounts receivable | 7,711 |  | 7,711 |  | 6,538
Inventory | 3,697 |  | 3,697 |  | 4,254
Total segment assets | 11,408 |  | 11,408 |  | 10,792
Operating Segments [Member] | Asia Region Sales & Service Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | 307 | 239 | 560 | 435 |
Depreciation and amortization | 295 | 294 | 874 | 876 |
Accounts receivable | 36,800 |  | 36,800 |  | 44,207
Inventory | 27,612 |  | 27,612 |  | 25,094
Total segment assets | 64,412 |  | 64,412 |  | 69,301
Corporate, Eliminations and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Capital expenditures | 378 | 513 | 1,610 | 1,718 |
Depreciation and amortization | 700 | 685 | 2,012 | 1,837 |
Accounts receivable | 41,083 |  | 41,083 |  | 39,629
Inventory | (7,326) |  | (7,326) |  | (8,834)
Total segment assets | $ 33,757 |  | $ 33,757 |  | $ 30,795

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