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Activity and Balances of Restructuring Reserves in Consolidated Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 45 $ 342 $ 614
Restructuring expenses     32
Change in estimate (5) (57) (64)
Cash payments made (10) (240) (240)
Ending Balance 30 45 342
Hub
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 29 321 501
Restructuring expenses     32
Change in estimate (5) (58) (62)
Cash payments made (6) (234) (150)
Ending Balance 18 29 321
Hub | Headcount Reduction
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 5 225 364
Restructuring expenses     9
Change in estimate (5) (9) (39)
Cash payments made   (211) (109)
Ending Balance   5 225
Hub | Consolidation Of Facilities
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 24 96 137
Restructuring expenses     23
Change in estimate   (49) (23)
Cash payments made (6) (23) (41)
Ending Balance 18 24 96
Mode | Headcount Reduction
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 16 21 113
Change in estimate   1 (2)
Cash payments made (4) (6) (90)
Ending Balance $ 12 $ 16 $ 21