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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Operating Statistics [Line Items] |  |  |  |  |
Capital expenditures | $ 3,004 | $ 3,445 | $ 6,360 | $ 8,012 |
Depreciation and amortization | 4,378 | 3,414 | 8,470 | 6,557 |
Accounts receivable | 95,771 |  | 95,771 |  | 82,060
Inventory | 137,006 |  | 137,006 |  | 134,639
Total segment assets | 232,777 |  | 232,777 |  | 216,699
Advanced Manufacturing Capital Equipment [Member] |  |  |  |  |
Operating Statistics [Line Items] |  |  |  |  |
Capital expenditures | 2,094 | 1,464 | 4,706 | 4,639 |
Depreciation and amortization | 3,071 | 2,263 | 5,958 | 4,388 |
Accounts receivable | 13,151 |  | 13,151 |  | 9,644
Inventory | 111,253 |  | 111,253 |  | 108,397
Total segment assets | 124,404 |  | 124,404 |  | 118,041
Analytical Solutions Group [Member] |  |  |  |  |
Operating Statistics [Line Items] |  |  |  |  |
Capital expenditures | 29 | 300 | 140 | 415 |
Depreciation and amortization | 307 | 236 | 604 | 467 |
Accounts receivable | 4,004 |  | 4,004 |  | 5,889
Inventory | 4,090 |  | 4,090 |  | 3,841
Total segment assets | 8,094 |  | 8,094 |  | 9,730
Europe Region Sales & Service Operations [Member] |  |  |  |  |
Operating Statistics [Line Items] |  |  |  |  |
Capital expenditures | 98 | 29 | 113 | 74 |
Depreciation and amortization | 81 | 103 | 174 | 203 |
Accounts receivable | 6,741 |  | 6,741 |  | 5,813
Inventory | 3,614 |  | 3,614 |  | 3,691
Total segment assets | 10,355 |  | 10,355 |  | 9,504
Asia Region Sales & Service Operations [Member] |  |  |  |  |
Operating Statistics [Line Items] |  |  |  |  |
Capital expenditures | 133 | 124 | 196 | 417 |
Depreciation and amortization | 288 | 423 | 582 | 793 |
Accounts receivable | 36,644 |  | 36,644 |  | 32,088
Inventory | 26,217 |  | 26,217 |  | 29,534
Total segment assets | 62,861 |  | 62,861 |  | 61,622
Corporate, Eliminations and Other [Member] |  |  |  |  |
Operating Statistics [Line Items] |  |  |  |  |
Capital expenditures | 650 | 1,528 | 1,205 | 2,467 |
Depreciation and amortization | 631 | 389 | 1,152 | 706 |
Accounts receivable | 35,231 |  | 35,231 |  | 28,626
Inventory | (8,168) |  | (8,168) |  | (10,824)
Total segment assets | $ 27,063 |  | $ 27,063 |  | $ 17,802

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