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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