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Fair Value Measurement (Detail) - (Table) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period 60,838 26,381   292,675 240,709    
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 3,000   $ 3,482,000        
Changes in fair value on contingent liability       $ (754,000) $ 1,518,000    
Assets:              
Available-for-sale Securities, Current 57,324,000 $ 32,546,000   57,324,000 32,546,000 $ 39,495,000  
Notes Receivable, Related Parties, Noncurrent 2,466,000 2,817,000   2,466,000 2,817,000 2,644,000  
Available-for-sale Securities, Noncurrent 41,871,000 90,144,000   41,871,000 90,144,000 70,559,000  
Contingent payment liability 23,050,000 $ 0   23,050,000 0 0  
Liabilities:              
Foreign Currency Contract, Asset, Fair Value Disclosure $ 414,000     414,000   191,000  
Available-for-sale Securities, Gross Unrealized Loss       118,000 388,000    
Available-for-sale Securities, Gross Unrealized Gain       53,000      
Proceeds from Collection of Notes Receivable       $ (221,000) $ 0    
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share $ 34.73 $ 33.60   $ 33.08 $ 31.85    
Repayment of Notes Receivable from Related Parties       $ (205,000) $ (205,000)    
Increase (Decrease) in Accrued Interest Receivable, Net       27,000 32,000    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       (5,321,000) (6,281,000) 16,402,000  
Fair Value [Member]              
Assets:              
Cash Equivalents $ 13,324,000     13,324,000   3,309,000  
Current marketable securities – available for sale           39,495,000  
Long-term marketable securities – available for sale           70,559,000  
Total assets 112,519,000     112,519,000   113,554,000  
Contingent payment liability 24,923,000     24,923,000   7,948,000 $ 24,775,000
Liabilities:              
Total liabilities 25,337,000     25,337,000   7,948,000  
Fair Value [Member] | Forward contracts [Member]              
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure 414,000     414,000      
Fair Value, Inputs, Level 1 [Member]              
Assets:              
Cash Equivalents 13,324,000     13,324,000   3,309,000  
Current marketable securities – available for sale 57,324,000     57,324,000   39,495,000  
Long-term marketable securities – available for sale 41,871,000     41,871,000   70,559,000  
Total assets 112,519,000     112,519,000   113,363,000  
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     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     0   0  
Total assets 0     0   191,000  
Contingent payment liability 0     0   0  
Liabilities:              
Total liabilities 414,000     414,000   0  
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]              
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure 414,000     414,000      
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     0   0  
Total assets 0     0   0  
Contingent payment liability 24,923,000     24,923,000   7,948,000  
Liabilities:              
Total liabilities 24,923,000     24,923,000   7,948,000  
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]              
Liabilities:              
Foreign Currency Contracts, Liability, Fair Value Disclosure 0     0      
Sm canada [Member]              
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 2,741,000            
Other Long-term Investments [Member]              
Liabilities:              
Available-for-sale Securities, Gross Unrealized Loss       48,000 155,000    
Available-for-sale Securities, Gross Unrealized Gain         $ 550,000    
Changes Measurement [Member]              
Liabilities:              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ (754,000)   $ (425,000)