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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
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Capital expenditures $ 3,098 $ 3,356  
Depreciation and amortization 4,150 4,092  
Accounts receivable 119,463   116,744
Inventory 147,511   142,727
Total segment assets 266,974   259,471
Advanced Manufacturing Capital Equipment [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 1,709 2,612  
Depreciation and amortization 2,911 2,941  
Accounts receivable 17,055   20,767
Inventory 121,897   117,822
Total segment assets 138,952   138,589
Analytical Solutions Group [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 1,014 111  
Depreciation and amortization 214 243  
Accounts receivable 4,513   5,603
Inventory 4,342   4,391
Total segment assets 8,855   9,994
Europe Region Sales & Service Operations [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 15 15  
Depreciation and amortization 90 74  
Accounts receivable 7,592   6,538
Inventory 4,305   4,254
Total segment assets 11,897   10,792
Asia Region Sales & Service Operations [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 122 63  
Depreciation and amortization 289 294  
Accounts receivable 43,216   44,207
Inventory 26,475   25,094
Total segment assets 69,691   69,301
Corporate, Eliminations and Other [Member]
      
Segment Reporting Information [Line Items]      
Capital expenditures 238 555  
Depreciation and amortization 646 540  
Accounts receivable 47,087   39,629
Inventory (9,508)   (8,834)
Total segment assets $ 37,579   $ 30,795