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Business Combinations - Additional Information (Detail)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
Jan. 08, 2016
USD ($)
Nov. 20, 2015
USD ($)
Nov. 20, 2015
EUR (€)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Nov. 20, 2015
EUR (€)
Business Acquisition [Line Items]                                
Acquisition transaction, integration and other costs                         $ 3,187      
Business acquisition, revenue recognized       $ 18,154 $ 19,972 $ 16,699 $ 16,541   $ 17,364 $ 15,914 $ 14,415 $ 14,205 71,366 $ 61,898 $ 57,439  
Business acquisition, loss recognized       $ 2,577 $ 3,934 $ 821 2,653   $ 1,358 $ 3,924 $ 3,051 $ 3,614 $ 9,985 11,947 $ 12,031  
Creagh Medical Ltd [Member]                                
Business Acquisition [Line Items]                                
Outstanding common shares and voting shares percentage   100.00%   100.00%                 100.00%     100.00%
Payments to acquire business             32,100           $ 28,274      
Upfront payments   $ 19,300 € 18                   18,449      
Contingent milestone payments   12,800                           € 12
Acquisition transaction, integration and other costs                         $ 2,700      
Creagh Medical Ltd [Member] | Maximum [Member]                                
Business Acquisition [Line Items]                                
Payments to acquire business   $ 32,000 € 30         € 30                
NorMedix, Inc. [Member]                                
Business Acquisition [Line Items]                                
Outstanding common shares and voting shares percentage 100.00%     100.00%                 100.00%      
Payments to acquire business                         $ 10,425      
Upfront payments $ 7,000                       6,905      
Contingent milestone payments 7,000                              
Acquisition transaction, integration and other costs                         300      
NorMedix, Inc. [Member] | Maximum [Member]                                
Business Acquisition [Line Items]                                
Payments to acquire business $ 14,000                              
Creagh Medical and NorMedix [Member]                                
Business Acquisition [Line Items]                                
Acquisition transaction, integration and other costs             $ 2,500                  
Business acquisition, revenue recognized                         4,100      
Business acquisition, loss recognized                         (3,100)      
Creagh Medical and NorMedix [Member] | Unaudited Pro Forma [Member]                                
Business Acquisition [Line Items]                                
Amortization expense on intangible assets                         2,800 3,200    
Contingent consideration accretion expense                         1,800 2,100    
Non-recurring professional fees                         3,200      
Tax effect impact                         $ 200 $ 500