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- Additional Information (Detail)
$ in Thousands
12 Months Ended
Oct. 06, 2017
USD ($)
payment
Dec. 31, 2018
USD ($)
payment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
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     $ 220,550 $ 0
Triage Business        
Business Acquisition [Line Items]        
Cash consideration 399,798      
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   0    
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