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Schedule of Restructuring and Other Net (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve      
Ending balance $ 485    
Pre Two Thousand Eleven Restructuring Plan
      
Restructuring Cost and Reserve      
Beginning Balance 1,084 1,862 3,975
Provision     117
Change in estimate (553)   (330)
Cash payments (531) (778) (1,900)
Ending balance   1,084 1,862
Q1 2011 Activity
      
Restructuring Cost and Reserve      
Beginning Balance   96  
Provision     572
Cash payments   (96) (476)
Ending balance     96
Q2 2011 Activity
      
Restructuring Cost and Reserve      
Beginning Balance   229  
Provision     344
Cash payments   (229) (115)
Ending balance     229
Q2 2012 Activity
      
Restructuring Cost and Reserve      
Provision   286  
Change in estimate   (4)  
Cash payments   (282)  
Quarter Three Two Thousand Twelve Activity
      
Restructuring Cost and Reserve      
Beginning Balance 243    
Provision   687  
Cash payments (243) (444)  
Ending balance   243  
Q3 2013 Activity
      
Restructuring Cost and Reserve      
Provision 1,337    
Cash payments (966)    
Ending balance 371    
Q4 2013 Activity
      
Restructuring Cost and Reserve      
Provision 600    
Cash payments (486)    
Ending balance 114    
Employee Serverance And Benefits
      
Restructuring Cost and Reserve      
Ending balance 485    
Employee Serverance And Benefits | Pre Two Thousand Eleven Restructuring Plan
      
Restructuring Cost and Reserve      
Beginning Balance     712
Provision     117
Change in estimate     155
Cash payments     (984)
Employee Serverance And Benefits | Q1 2011 Activity
      
Restructuring Cost and Reserve      
Beginning Balance   96  
Provision     572
Cash payments   (96) (476)
Ending balance     96
Employee Serverance And Benefits | Q2 2011 Activity
      
Restructuring Cost and Reserve      
Beginning Balance   229  
Provision     344
Cash payments   (229) (115)
Ending balance     229
Employee Serverance And Benefits | Q2 2012 Activity
      
Restructuring Cost and Reserve      
Provision   286  
Change in estimate   (4)  
Cash payments   (282)  
Employee Serverance And Benefits | Quarter Three Two Thousand Twelve Activity
      
Restructuring Cost and Reserve      
Beginning Balance 243    
Provision   687  
Cash payments (243) (444)  
Ending balance   243  
Employee Serverance And Benefits | Q3 2013 Activity
      
Restructuring Cost and Reserve      
Provision 1,337    
Cash payments (966)    
Ending balance 371    
Employee Serverance And Benefits | Q4 2013 Activity
      
Restructuring Cost and Reserve      
Provision 600    
Cash payments (486)    
Ending balance 114    
Facility Exit Costs | Pre Two Thousand Eleven Restructuring Plan
      
Restructuring Cost and Reserve      
Beginning Balance 1,084 1,862 3,263
Change in estimate (553)   (485)
Cash payments (531) (778) (916)
Ending balance   $ 1,084 $ 1,862