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Activity and Balances of Restructuring Reserves in Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]    
Beginning Balance $ 614  
Restructuring expenses 32 1,398
Change in estimate (126) (140)
Cash payments made (499) (644)
Ending Balance 21 614
Hub
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 501  
Restructuring expenses 32 1,035
Change in estimate (125) (140)
Cash payments made (399) (394)
Ending Balance 9 501
Hub | Headcount Reduction
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 364  
Restructuring expenses 9 851
Change in estimate (53) (140)
Cash payments made (320) (347)
Ending Balance   364
Hub | Consolidation of Facilities
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 137  
Restructuring expenses 23 184
Change in estimate (72)  
Cash payments made (79) (47)
Ending Balance 9 137
Mode | Headcount Reduction
   
Restructuring Cost and Reserve [Line Items]    
Beginning Balance 113  
Restructuring expenses   363
Change in estimate (1)  
Cash payments made (100) (250)
Ending Balance $ 12 $ 113