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Summary of Changes in Restructuring-Related Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 2,284 $ 0  
Costs Incurred 279 14,732 $ 0
Cash Payments (2,201) (12,008)  
Non-cash Settlements 0 (441)  
Adjustments and Other (306) 1  
Ending Balance 56 2,284 0
Severance and related employee benefits      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 2,215 0  
Costs Incurred 0 13,162  
Cash Payments (1,885) (10,746)  
Non-cash Settlements 0 0  
Adjustments and Other (298) (201)  
Ending Balance 32 2,215 0
Contract termination costs      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0 0  
Costs Incurred 0 1,159  
Cash Payments 0 (960)  
Non-cash Settlements 0 (441)  
Adjustments and Other 0 242  
Ending Balance 0 0 0
Other costs      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 69 0  
Costs Incurred 279 411  
Cash Payments (316) (302)  
Non-cash Settlements 0 0  
Adjustments and Other (8) (40)  
Ending Balance $ 24 $ 69 $ 0