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Fair Value Measurement (Detail) - (Table) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period 324,352 231,837        
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 7,000 $ 3,000   $ 5,000 $ 3,000  
Changes in fair value on contingent liability 0 832,000        
Assets:            
Available-for-sale Securities, Current 54,669,000 45,682,000 $ 64,027,000      
Notes Receivable, Related Parties, Noncurrent 2,199,000 2,555,000 2,289,000      
Available-for-sale Securities, Noncurrent 20,507,000 53,298,000 29,523,000      
Contingent payment liability   20,617,000 20,617,000     $ 10,000,000
business combinations contingent liability payment     7,359,000      
Liabilities:            
Foreign Currency Contract, Asset, Fair Value Disclosure 201,000          
Available-for-sale Securities, Gross Unrealized Loss $ 118,000 208,000        
Available-for-sale Securities, Gross Unrealized Gain   $ 1,000        
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share $ 36.60 $ 32.65        
Repayment of Notes Receivable from Related Parties $ (102,000) $ (103,000)        
Increase (Decrease) in Accrued Interest Receivable, Net 12,000 14,000        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (7,000,000) 0 (11,206,000)      
Fair Value [Member]            
Assets:            
Cash Equivalents 50,496,000   58,436,000      
Current marketable securities – available for sale     64,027,000      
Long-term marketable securities – available for sale     29,523,000      
Total assets 125,873,000   151,986,000      
Contingent payment liability 3,000,000   10,000,000 $ 7,948,000    
Liabilities:            
Total liabilities 3,000,000   10,783,000      
Fair Value [Member] | Forward contracts [Member]            
Liabilities:            
Foreign Currency Contracts, Liability, Fair Value Disclosure     783,000      
Fair Value, Inputs, Level 1 [Member]            
Assets:            
Cash Equivalents 50,496,000   58,436,000      
Current marketable securities – available for sale 54,669,000   64,027,000      
Long-term marketable securities – available for sale 20,507,000   29,523,000      
Total assets 125,672,000   151,986,000      
Contingent payment liability 0   0      
Liabilities:            
Total liabilities 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      
Current marketable securities – available for sale 0   0      
Long-term marketable securities – available for sale 0   0      
Total assets 201,000   0      
Contingent payment liability 0   0      
Liabilities:            
Total liabilities 0   783,000      
Foreign Currency Contract, Asset, Fair Value Disclosure 201,000          
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]            
Liabilities:            
Foreign Currency Contracts, Liability, Fair Value Disclosure     783,000      
Fair Value, Inputs, Level 3 [Member]            
Assets:            
Cash Equivalents 0   0      
Current marketable securities – available for sale 0   0      
Long-term marketable securities – available for sale 0   0      
Total assets 0   0      
Contingent payment liability 3,000,000   10,000,000      
Liabilities:            
Total liabilities $ 3,000,000   10,000,000      
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   45,000        
Available-for-sale Securities, Gross Unrealized Gain   $ 109,000        
Changes Measurement [Member]            
Liabilities:            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     $ (11,206,000)