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Fair Value Measurement (Detail) - (Table)
$ / shares in Units, number in Thousands, CAD in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 13, 2014
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2012
CAD
Jun. 25, 2007
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period | shares 21,006       23,074 261,715 416,275            
Business Acquisition, Contingent Consideration, Actual Cash Payment   $ 2,798,000 $ 3,483,000 $ 1,000                  
Changes in fair value on contingent liability           $ (45,000) $ (2,504,000)            
Assets:                          
Available-for-sale Securities, Current $ 30,301,000     32,424,000 $ 22,834,000 30,301,000 22,834,000 $ 32,424,000          
Notes Receivable, Related Parties, Noncurrent 2,730,000     2,990,000 3,074,000 2,730,000 3,074,000 2,990,000         $ 3,000,000
Available-for-sale Securities, Noncurrent 90,436,000     88,465,000 89,705,000 90,436,000 89,705,000 88,465,000          
Notes receivable 749,000     1,158,000 1,197,000 749,000 1,197,000 1,158,000          
Contingent payment liability 0     $ 8,012,000 $ 13,286,000 0 13,286,000 8,012,000          
Liabilities:                          
Foreign Currency Contract, Asset, Fair Value Disclosure $ 160,000 160,000       160,000              
Available-for-sale Securities, Gross Unrealized Loss           350,000 640,000            
Available-for-sale Securities, Gross Unrealized Gain           939,000              
Debt Instrument, Decrease, Forgiveness               409,000          
Proceeds from Collection of Notes Receivable           $ (249,000) $ (342,000) (466,000)          
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share | $ / shares $ 32.72       $ 31.02 $ 31.92 $ 26.94            
Repayment of Notes Receivable from Related Parties           $ (308,000) $ (306,000) (409,000)          
Increase (Decrease) in Accrued Interest Receivable, Net           $ 48,000 52,000 $ 71,000          
Foreign Currency Exchange Rate, Translation (160)     (254)   (160)   (254)          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability           $ (8,048,000) (2,950,000) $ 6,270,000          
Note receivable – Seller of SM Canada [Member]                          
Assets:                          
Notes receivable                     $ 3,085,000 CAD 3,107  
Fair Value [Member]                          
Assets:                          
Cash Equivalents $ 3,308,000     $ 2,242,000   3,308,000   2,242,000          
Current marketable securities – available for sale       32,424,000       32,424,000          
Long-term marketable securities – available for sale       88,465,000       88,465,000          
Total assets 127,684,000     127,279,000   127,684,000   127,279,000          
Contingent payment liability 16,682,000     24,775,000   16,682,000   24,775,000 $ 38,633,000        
Liabilities:                          
Total liabilities 16,682,000     24,775,000   16,682,000   24,775,000          
Fair Value [Member] | Note receivable – related party [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 2,730,000     2,990,000   2,730,000   2,990,000 3,328,000        
Fair Value [Member] | Note receivable – Seller of SM Canada [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 749,000     1,158,000   749,000   1,158,000 $ 1,878,000        
Fair Value, Inputs, Level 1 [Member]                          
Assets:                          
Cash Equivalents 3,308,000     2,242,000   3,308,000   2,242,000          
Current marketable securities – available for sale 30,301,000     32,424,000   30,301,000   32,424,000          
Long-term marketable securities – available for sale 90,436,000     88,465,000   90,436,000   88,465,000          
Total assets 124,045,000     123,131,000   124,045,000   123,131,000          
Contingent payment liability 0     0   0   0          
Liabilities:                          
Total liabilities 0     0   0   0          
Fair Value, Inputs, Level 1 [Member] | Note receivable – related party [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 0     0   0   0          
Fair Value, Inputs, Level 1 [Member] | Note receivable – Seller of SM Canada [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 0     0   0   0          
Fair Value, Inputs, Level 2 [Member]                          
Assets:                          
Cash Equivalents 0     0   0   0          
Current marketable securities – available for sale 0     0   0   0          
Long-term marketable securities – available for sale 0     0   0   0          
Total assets 160,000     0   160,000   0          
Contingent payment liability 0     0   0   0          
Liabilities:                          
Total liabilities 0     0   0   0          
Foreign Currency Contract, Asset, Fair Value Disclosure   $ 160,000                      
Fair Value, Inputs, Level 2 [Member] | Note receivable – related party [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 0     0   0   0          
Fair Value, Inputs, Level 2 [Member] | Note receivable – Seller of SM Canada [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 0     0   0   0          
Fair Value, Inputs, Level 3 [Member]                          
Assets:                          
Cash Equivalents 0     0   0   0          
Current marketable securities – available for sale 0     0   0   0          
Long-term marketable securities – available for sale 0     0   0   0          
Total assets 3,479,000     4,148,000   3,479,000   4,148,000          
Contingent payment liability 16,682,000     24,775,000   16,682,000   24,775,000          
Liabilities:                          
Total liabilities 16,682,000     24,775,000   16,682,000   24,775,000          
Fair Value, Inputs, Level 3 [Member] | Note receivable – related party [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure 2,730,000     2,990,000   2,730,000   2,990,000          
Fair Value, Inputs, Level 3 [Member] | Note receivable – Seller of SM Canada [Member]                          
Assets:                          
Notes Receivable, Fair Value Disclosure $ 749,000     $ 1,158,000   749,000   $ 1,158,000          
Contingent Consideration Type [Domain]                          
Liabilities:                          
Foreign Currency Exchange Rate, Translation       (2,012)       (2,012)          
Dolce Vita [Member]                          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                   $ 5,000,000      
Other Long-term Investments [Member]                          
Liabilities:                          
Available-for-sale Securities, Gross Unrealized Loss           35,000 962,000            
Available-for-sale Securities, Gross Unrealized Gain             $ 151,000            
Changes Measurement [Member]                          
Liabilities:                          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability           $ (45,000)   $ (5,576,000)