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Fair Value Measurement (Detail) - (Table) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period 77,075 79,901   480,762 566,429    
Business Acquisition, Contingent Consideration, Actual Cash Payment     $ 7,000,000     $ 7,000,000  
Assets:              
Available-for-sale Securities, Current $ 36,096,000 $ 64,327,000   $ 36,096,000 $ 64,327,000 66,968,000  
Notes Receivable, Related Parties, Noncurrent 1,743,000 2,108,000   1,743,000 2,108,000 1,927,000  
Available-for-sale Securities, Noncurrent 0 $ 2,122,000   0 2,122,000 0  
Contingent payment liability           3,000  
Business Acquisition, Contingent Consideration, Change in Estimate       (3,000,000)      
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure $ 139,000     $ 139,000      
Foreign Currency Contract, Asset, Fair Value Disclosure           707,000  
Available-for-sale Securities, Gross Unrealized Loss         $ 114,000    
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share $ 33.77 $ 25.94   $ 27.68 $ 24.62    
Repayment of Notes Receivable from Related Parties       $ (204,000) $ (205,000)    
Increase (Decrease) in Accrued Interest Receivable, Net       21,000 24,000    
Fair Value [Member]              
Assets:              
Cash Equivalents $ 96,781,000     96,781,000   77,050,000  
Current marketable securities – available for sale           66,968,000  
Total assets 132,877,000     132,877,000   144,725,000  
Contingent payment liability 0     0   3,000,000 $ 10,000,000
Liabilities:              
Total liabilities 139,000     139,000   3,000,000  
Fair Value [Member] | Forward contracts [Member]              
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure 139,000     139,000      
Fair Value, Inputs, Level 1 [Member]              
Assets:              
Cash Equivalents 96,781,000     96,781,000   77,050,000  
Current marketable securities – available for sale 36,096,000     36,096,000   66,968,000  
Total assets 132,877,000     132,877,000   144,018,000  
Contingent payment liability           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     0      
Fair Value, Inputs, Level 2 [Member]              
Assets:              
Cash Equivalents 0     0   0  
Current marketable securities – available for sale 0     0   0  
Total assets 0     0   707,000  
Contingent payment liability           0  
Liabilities:              
Total liabilities 139,000     139,000   0  
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]              
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure 139,000     139,000      
Fair Value, Inputs, Level 3 [Member]              
Assets:              
Cash Equivalents 0     0   0  
Current marketable securities – available for sale 0     0   0  
Total assets 0     0   0  
Contingent payment liability           3,000,000  
Liabilities:              
Total liabilities 0     0   3,000,000  
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]              
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure $ 0     $ 0      
Other Long-term Investments [Member]              
Liabilities:              
Available-for-sale Securities, Gross Unrealized Loss         $ 21,000    
Changes Measurement [Member]              
Liabilities:              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability           $ 0