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Reorganization - Summary of Roll Forward of Activity in Reorganization Accrual (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
Restructuring Cost and Reserve [Line Items]        
Additions $ 314 $ 51 $ 1,905 $ 1,394
Workforce Reduction [Member]
       
Restructuring Cost and Reserve [Line Items]        
Accrual Beginning Balance     14  
Additions     1,905  
Cash payments     (1,319)  
Accrual Ending Balance $ 600   $ 600