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Fair Value Measurement (Detail) - (Table)
$ / shares in Units, number in Thousands, CAD in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
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 214,328 298,527          
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 3,483,000            
Changes in fair value on contingent liability 0 $ 427,000          
Assets:              
Available-for-sale Securities, Current 34,419,000 27,337,000 $ 32,424,000        
Notes Receivable, Related Parties, Noncurrent 2,903,000 3,244,000 2,990,000       $ 3,000,000
Available-for-sale Securities, Noncurrent 87,575,000 90,907,000 88,465,000        
Notes receivable 1,238,000 1,727,000 1,158,000        
Contingent payment liability 4,941,000 27,605,000 8,012,000        
Liabilities:              
Foreign Currency Contract, Asset, Fair Value Disclosure 72,000            
Available-for-sale Securities, Gross Unrealized Loss 443,000 47,000          
Available-for-sale Securities, Gross Unrealized Gain $ 296,000 $ 2,000          
Debt Instrument, Decrease, Forgiveness     409,000        
Proceeds from Collection of Notes Receivable   (466,000)        
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share | $ / shares $ 31.63 $ 26.73          
Repayment of Notes Receivable from Related Parties $ (103,000) $ (103,000) (409,000)        
Increase (Decrease) in Accrued Interest Receivable, Net $ 16,000 19,000 $ (71,000)        
Foreign Currency Exchange Rate, Translation 80   (254)        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ (3,483,000) 0 $ 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 2,756,000   2,242,000        
Current marketable securities – available for sale     32,424,000        
Long-term marketable securities – available for sale     88,465,000        
Total assets 128,963,000   127,279,000        
Contingent payment liability 21,292,000   24,775,000 $ 38,633,000      
Liabilities:              
Total liabilities 21,292,000   24,775,000        
Fair Value [Member] | Note receivable – related party [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 2,903,000   2,990,000 3,328,000      
Fair Value [Member] | Note receivable – Seller of SM Canada [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 1,238,000   1,158,000 $ 1,878,000      
Fair Value, Inputs, Level 1 [Member]              
Assets:              
Cash Equivalents 2,756,000   2,242,000        
Current marketable securities – available for sale 34,419,000   32,424,000        
Long-term marketable securities – available for sale 87,575,000   88,465,000        
Total assets 124,750,000   123,131,000        
Contingent payment liability 0   0        
Liabilities:              
Total liabilities 0   0        
Fair Value, Inputs, Level 1 [Member] | Note receivable – related party [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 0   0        
Fair Value, Inputs, Level 1 [Member] | Note receivable – Seller of SM Canada [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 0   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 72,000   0        
Contingent payment liability 0   0        
Liabilities:              
Total liabilities 0   0        
Foreign Currency Contract, Asset, Fair Value Disclosure 72,000            
Fair Value, Inputs, Level 2 [Member] | Note receivable – related party [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 0   0        
Fair Value, Inputs, Level 2 [Member] | Note receivable – Seller of SM Canada [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 0   0        
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 4,141,000   4,148,000        
Contingent payment liability 21,292,000   24,775,000        
Liabilities:              
Total liabilities 21,292,000   24,775,000        
Fair Value, Inputs, Level 3 [Member] | Note receivable – related party [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure 2,903,000   2,990,000        
Fair Value, Inputs, Level 3 [Member] | Note receivable – Seller of SM Canada [Member]              
Assets:              
Notes Receivable, Fair Value Disclosure $ 1,238,000   $ 1,158,000        
Contingent Consideration Type [Domain]              
Liabilities:              
Foreign Currency Exchange Rate, Translation   (2,012)        
Other Long-term Investments [Member]              
Liabilities:              
Available-for-sale Securities, Gross Unrealized Loss $ 350,000 86,000          
Available-for-sale Securities, Gross Unrealized Gain   $ 226,000          
Changes Measurement [Member]              
Liabilities:              
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability     $ (5,576,000)