Annual report pursuant to Section 13 and 15(d)

Business Combinations (Textual) (Detail)

v3.6.0.2
Business Combinations (Textual) (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 06, 2016
USD ($)
Mar. 02, 2016
USD ($)
Jan. 11, 2016
USD ($)
Nov. 13, 2015
USD ($)
Jan. 23, 2015
USD ($)
Jan. 02, 2015
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2014
USD ($)
agreement
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]                          
Goodwill               $ 107,466     $ 113,112 $ 107,466 $ 96,316
Contingent consideration               6,209     3,043 6,209  
Contingent consideration earn-out                     (1,284) (664) 0
Impairment of intangible assets                     0 0 598
General and administrative                     $ 50,877 $ 46,363 45,444
Trademarks and trade names [Member]                          
Business Acquisition [Line Items]                          
Impairment of intangible assets                         $ 600
RetCam [Member]                          
Business Acquisition [Line Items]                          
Purchase price paid in cash to acquire entity $ 10,600                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 3,300                        
Goodwill 3,200                        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities $ 2,000                        
Identifiable intangible assets, average useful life 5 years                        
Contingent consideration $ 2,000                        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred             $ 1,100            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets $ 7,200                        
NeuroQuest [Member]                          
Business Acquisition [Line Items]                          
Purchase price paid in cash to acquire entity   $ 4,600                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   1,300                      
Goodwill   3,500                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   $ 100                      
Identifiable intangible assets, average useful life   5 years                      
Contingent consideration   $ 500                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets   $ 500                      
Monarch Medical Diagnostics, LLC [Member]                          
Business Acquisition [Line Items]                          
Purchase price paid in cash to acquire entity       $ 2,700                  
Contingent consideration     $ 1,000                    
Tangible assets     112                    
Monarch [Member]                          
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     1,200                    
Goodwill     $ 2,400                    
Identifiable intangible assets, average useful life     5 years                    
Global Neuro-Diagnostics [Member]                          
Business Acquisition [Line Items]                          
Purchase price paid in cash to acquire entity         $ 11,400                
Contingent consideration         3,200     $ 500          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles         4,800                
Goodwill         $ 8,900                
Identifiable intangible assets, average useful life         5 years                
Net liabilities         $ 500                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets         $ 1,500                
NicView [Member]                          
Business Acquisition [Line Items]                          
Purchase price paid in cash to acquire entity           $ 1,100              
Tangible assets           300              
Goodwill           2,700              
Net liabilities           600              
Contingent consideration           $ 1,300              
Newborn Hearing Screening Services [Member]                          
Business Acquisition [Line Items]                          
Purchase price paid in cash to acquire entity                   $ 2,600      
Contingent consideration                   $ 800      
Number of asset purchase agreements | agreement                   2      
Contingent consideration earn-out                 $ 700