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Fair Value Measurement (Detail) - (Table) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period 56,355   21,006   349,030 261,715    
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 2,000 $ 3,000   $ 3,482,000        
Changes in fair value on contingent liability         $ (589,000) $ (45,000)    
Assets:                
Available-for-sale Securities, Current 50,976,000   $ 30,301,000   50,976,000 30,301,000 $ 39,495,000  
Notes Receivable, Related Parties, Noncurrent 2,378,000   2,730,000   2,378,000 2,730,000 2,644,000  
Available-for-sale Securities, Noncurrent 33,839,000   90,436,000   33,839,000 90,436,000 70,559,000  
Contingent payment liability 23,050,000   $ 0   23,050,000 0 0  
Liabilities:                
Foreign Currency Contract, Asset, Fair Value Disclosure $ 611,000       611,000   191,000  
Available-for-sale Securities, Gross Unrealized Loss         93,000 220,000    
Available-for-sale Securities, Gross Unrealized Gain         37,000      
Proceeds from Collection of Notes Receivable         $ (221,000) $ (249,000)    
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share $ 34.72   $ 32.72   $ 33.35 $ 31.92    
Repayment of Notes Receivable from Related Parties         $ (307,000) $ (308,000)    
Increase (Decrease) in Accrued Interest Receivable, Net         41,000 48,000    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability         (7,359,000) (8,048,000) 16,402,000  
Fair Value [Member]                
Assets:                
Cash Equivalents $ 13,350,000       13,350,000   3,309,000  
Current marketable securities – available for sale             39,495,000  
Long-term marketable securities – available for sale             70,559,000  
Total assets 98,165,000       98,165,000   113,554,000  
Contingent payment liability 23,050,000       23,050,000   7,948,000 $ 24,775,000
Liabilities:                
Total liabilities 23,661,000       23,661,000   7,948,000  
Fair Value [Member] | Forward contracts [Member]                
Liabilities:                
Foreign Currency Contracts, Liability, Fair Value Disclosure 611,000       611,000      
Fair Value, Inputs, Level 1 [Member]                
Assets:                
Cash Equivalents 13,350,000       13,350,000   3,309,000  
Current marketable securities – available for sale 50,976,000       50,976,000   39,495,000  
Long-term marketable securities – available for sale 33,839,000       33,839,000   70,559,000  
Total assets 98,165,000       98,165,000   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 611,000       611,000   0  
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]                
Liabilities:                
Foreign Currency Contracts, Liability, Fair Value Disclosure 611,000       611,000      
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 23,050,000       23,050,000   7,948,000  
Liabilities:                
Total liabilities 23,050,000       23,050,000   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         29,000 22,000    
Available-for-sale Securities, Gross Unrealized Gain           $ 592,000    
Changes Measurement [Member]                
Liabilities:                
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability         $ (589,000)   $ (425,000)