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Reconciliation of Beginning and Ending Liability Balances for Restructuring Charges (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Sep. 30, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]        
Accrual - Beginning balance   $ 3,149 $ 3,028  
Costs incurred and charged to expense   2,891 2,022  
Costs paid or settled   (3,012) (1,865)  
Accrual - Ending balance $ 3,149 3,028 3,185 $ 3,028
Twenty Sixteen Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Costs incurred and charged to expense     1,475  
Accrual - Ending balance     1,475  
Twenty Fifteen Restructuring Plan        
Restructuring Cost and Reserve [Line Items]        
Accrual - Beginning balance   3,149 3,028  
Costs incurred and charged to expense 3,200 2,891 547 6,000
Costs paid or settled   (3,012) (1,865)  
Accrual - Ending balance $ 3,149 $ 3,028 $ 1,710 $ 3,028