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Fair Value Measurement (Detail) - (Table) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period 132,304   84,533   698,732 523,545      
Business Acquisition, Contingent Consideration, Actual Cash Payment   $ 7,000   $ 2,741       $ 4,618 $ 3,482
Changes in fair value on contingent liability         $ 0 $ (589)      
Assets:                  
Available-for-sale Securities, Current $ 57,896   $ 50,976   57,896 50,976 $ 64,027    
Notes Receivable, Related Parties, Noncurrent 2,018   2,378   2,018 2,378 2,289    
Available-for-sale Securities, Noncurrent 0   $ 33,839   0 33,839 29,523    
Contingent payment liability             20,617    
business combinations contingent liability payment             7,359    
Liabilities:                  
Foreign Currency Contract, Asset, Fair Value Disclosure $ 262       262        
Available-for-sale Securities, Gross Unrealized Loss           93      
Available-for-sale Securities, Gross Unrealized Gain           4      
Proceeds from Collection of Notes Receivable         $ 0 $ (221)      
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share $ 30.25   $ 23.15   $ 25.68 $ 22.23      
Repayment of Notes Receivable from Related Parties         $ (307) $ (307)      
Increase (Decrease) in Accrued Interest Receivable, Net         35 41      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability         (7,000) (7,359) (11,206)    
Fair Value [Member]                  
Assets:                  
Cash Equivalents $ 89,782       89,782   58,436    
Current marketable securities – available for sale             64,027    
Long-term marketable securities – available for sale             29,523    
Total assets 147,940       147,940   151,986    
Contingent payment liability 3,000       3,000   10,000 $ 7,948  
Liabilities:                  
Total liabilities 3,000       3,000   10,783    
Fair Value [Member] | Forward contracts [Member]                  
Liabilities:                  
Foreign Currency Contracts, Liability, Fair Value Disclosure             783    
Fair Value, Inputs, Level 1 [Member]                  
Assets:                  
Cash Equivalents 89,782       89,782   58,436    
Current marketable securities – available for sale 57,896       57,896   64,027    
Long-term marketable securities – available for sale             29,523    
Total assets 147,678       147,678   151,986    
Contingent payment liability 0       0   0    
Liabilities:                  
Total liabilities 0       0   0    
Fair Value, Inputs, Level 1 [Member] | Forward contracts [Member]                  
Liabilities:                  
Foreign Currency Contracts, Liability, Fair Value Disclosure             0    
Fair Value, Inputs, Level 2 [Member]                  
Assets:                  
Cash Equivalents 0       0   0    
Current marketable securities – available for sale 0       0   0    
Long-term marketable securities – available for sale             0    
Total assets 262       262   0    
Contingent payment liability 0       0   0    
Liabilities:                  
Total liabilities 0       0   783    
Foreign Currency Contract, Asset, Fair Value Disclosure 262       262        
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]                  
Liabilities:                  
Foreign Currency Contracts, Liability, Fair Value Disclosure             783    
Fair Value, Inputs, Level 3 [Member]                  
Assets:                  
Cash Equivalents 0       0   0    
Current marketable securities – available for sale 0       0   0    
Long-term marketable securities – available for sale             0    
Total assets 0       0   0    
Contingent payment liability 3,000       3,000   10,000    
Liabilities:                  
Total liabilities $ 3,000       $ 3,000   10,000    
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]                  
Liabilities:                  
Foreign Currency Contracts, Liability, Fair Value Disclosure             0    
Other Long-term Investments [Member]                  
Liabilities:                  
Available-for-sale Securities, Gross Unrealized Loss           29      
Available-for-sale Securities, Gross Unrealized Gain           $ 37      
Changes Measurement [Member]                  
Liabilities:                  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability             $ (11,206)