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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
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Capital expenditures $ 12,410 $ 17,705 $ 15,567
Depreciation and amortization 17,102 14,442 12,980
Accounts receivable 116,744 82,060  
Inventory 142,727 134,639  
Total segment assets 259,471 216,699  
Advanced Manufacturing Capital Equipment [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 8,729 11,817 11,947
Depreciation and amortization 11,836 9,594 8,143
Accounts receivable 20,767 9,644  
Inventory 117,822 108,397  
Total segment assets 138,589 118,041  
Analytical Solutions Group [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 513 1,228 868
Depreciation and amortization 1,252 1,176 1,470
Accounts receivable 5,603 5,889  
Inventory 4,391 3,841  
Total segment assets 9,994 9,730  
Europe Region Sales & Service Operations [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 250 132 362
Depreciation and amortization 348 326 366
Accounts receivable 6,538 5,813  
Inventory 4,254 3,691  
Total segment assets 10,792 9,504  
Asia Region Sales & Service Operations [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 857 886 1,552
Depreciation and amortization 1,177 1,711 1,539
Accounts receivable 44,207 32,088  
Inventory 25,094 29,534  
Total segment assets 69,301 61,622  
Corporate, Eliminations and Other [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 2,061 3,642 838
Depreciation and amortization 2,489 1,635 1,462
Accounts receivable 39,629 28,626  
Inventory (8,834) (10,824)  
Total segment assets $ 30,795 $ 17,802