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Summary of Major Types of Costs, Cumulative Costs Incurred and Total Cost Expected Associated With Restructuring Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 279 $ 14,732 $ 0
Cumulative Costs Incurred To Date 15,011    
Total Expected Plan Costs 15,041    
Severance and related employee benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 13,162  
Cumulative Costs Incurred To Date 13,162    
Total Expected Plan Costs 13,162    
Contract termination costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 1,159  
Cumulative Costs Incurred To Date 1,159    
Total Expected Plan Costs 1,159    
Other costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 279 411  
Cumulative Costs Incurred To Date 690    
Total Expected Plan Costs 720    
Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 279 14,732  
Operating expenses | Severance and related employee benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 13,162  
Operating expenses | Contract termination costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 1,159  
Operating expenses | Other costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 279 $ 411