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Fair Value Measurement (Detail) - (Table) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 25, 2007
Proceeds from Loans   $ 640        
Business Acquisition, Contingent Consideration, Actual Cash Payment 3,315   3,315,000 0    
Assets:            
Available-for-sale Securities, Current 33,494,000   33,494,000 22,193,000 20,591,000  
Notes Receivable, Related Parties, Noncurrent 3,581,000   3,581,000 3,600,000 3,581,000 3,000,000
Available-for-sale Securities, Noncurrent 93,336,000   93,336,000 100,260,000 91,267,000  
Notes, Loans and Financing Receivable, Net, Noncurrent 2,552,000   2,552,000 3,085,000 3,171,000  
Contingent payment liability 25,100,000   25,100,000 27,896,000 24,100,000  
Liabilities:            
Foreign Currency Contract, Asset, Fair Value Disclosure 220,000   220,000      
Fair Value [Member]
            
Assets:            
Cash Equivalents 102,824,000   102,824,000   102,247,000  
Current marketable securities – available for sale         20,591,000  
Long-term marketable securities – available for sale         91,267,000  
Total assets 236,007,000   236,007,000   220,857,000  
Contingent payment liability 30,380,000   30,380,000   34,795,000  
Liabilities:            
Total liabilities 30,380,000   30,380,000   35,255,000  
Fair Value [Member] | Note receivable – related party [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure 3,581,000   3,581,000   3,581,000  
Fair Value [Member] | Forward contracts [Member]
            
Liabilities:            
Foreign Currency Contracts, Liability, Fair Value Disclosure 220,000   220,000   460,000  
Fair Value [Member] | Note receivable – Seller of SM Canada [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure         3,171,000  
Fair Value, Inputs, Level 1 [Member]
            
Assets:            
Cash Equivalents 102,824,000   102,824,000   102,247,000  
Current marketable securities – available for sale 33,494,000   33,494,000   20,591,000  
Long-term marketable securities – available for sale 93,336,000   93,336,000   91,267,000  
Total assets 229,654,000   229,654,000   214,105,000  
Contingent payment liability 0   0   0  
Liabilities:            
Total liabilities 0   0   0  
Fair Value, Inputs, Level 1 [Member] | Note receivable – related party [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure 0   0   0  
Fair Value, Inputs, Level 1 [Member] | Forward contracts [Member]
            
Liabilities:            
Foreign Currency Contracts, Liability, Fair Value Disclosure 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  
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 220,000   220,000   0  
Contingent payment liability 0   0   0  
Liabilities:            
Total liabilities 0   0   460,000  
Fair Value, Inputs, Level 2 [Member] | Note receivable – related party [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure 0   0   0  
Fair Value, Inputs, Level 2 [Member] | Forward contracts [Member]
            
Liabilities:            
Foreign Currency Contracts, Liability, Fair Value Disclosure 220,000   220,000   460,000  
Fair Value, Inputs, Level 2 [Member] | Note receivable – Seller of SM Canada [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure 0   0   0  
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 6,133,000   6,133,000   6,752,000  
Contingent payment liability 30,380,000   30,380,000   34,795,000  
Liabilities:            
Total liabilities 30,380,000   30,380,000   34,795,000  
Fair Value, Inputs, Level 3 [Member] | Note receivable – related party [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure 3,581,000   3,581,000   3,581,000  
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]
            
Liabilities:            
Foreign Currency Contracts, Liability, Fair Value Disclosure 0   0   0  
Fair Value, Inputs, Level 3 [Member] | Note receivable – Seller of SM Canada [Member]
            
Assets:            
Notes Receivable, Fair Value Disclosure $ 2,552,000   $ 2,552,000   $ 3,171,000