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- Additional Information (Detail)
$ in Thousands
12 Months Ended
Oct. 06, 2017
USD ($)
payment
Dec. 31, 2017
USD ($)
payment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Secured Debt   $ 245,000    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low   256,000    
Deferred consideration for acquisition of BNP Business     $ 0 $ 0
Triage Business        
Business Acquisition [Line Items]        
Cash consideration $ 399,798      
Secured Debt 245,000      
Contingent consideration—BNP Business 19,700      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   280,000    
Deferred consideration for acquisition of BNP Business   220,550    
Change in amount of contingent consideration, liability   19,700    
Consideration A [Member] | Triage Business        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low $ 16,000      
Contingent consideration—BNP Business   24,000    
Business Combination, Contingent Consideration Arrangements, Number Of Installment Payments | payment 5      
Business Combination, Contingent Consideration Arrangements, Amount Of Installment Payment $ 8,000      
Consideration B [Member] | Triage Business        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 240,000    
Business Combination, Contingent Consideration Arrangements, Number Of Installment Payments | payment   6    
Business Combination, Contingent Consideration Arrangements, Amount Of Installment Payment   $ 40,000    
Consideration C [Member] | Triage Business        
Business Acquisition [Line Items]        
Inventory related adjustment $ 205