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Fair Value Measurement (Detail) - (Table) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Aug. 13, 2014
Mar. 31, 2014
Jun. 25, 2007
Unrealized Gain (Loss) on Securities     $ 5,000   $ 1,387,000      
Business Acquisition, Contingent Consideration, Actual Cash Payment 5,160,000 3,315,000 8,475,000 7,420,000        
Loss Contingency Accrual, Period Increase (Decrease)     1,378,000 0        
Assets:                
Available-for-sale Securities, Current 16,989,000   16,989,000 19,848,000 20,591,000      
Notes Receivable, Related Parties, Noncurrent 3,581,000   3,581,000 3,581,000 3,581,000     3,000,000
Available-for-sale Securities, Noncurrent 2,573,000   2,573,000 92,431,000 91,267,000      
Notes, Loans and Financing Receivable, Net, Noncurrent 2,440,000   2,440,000 3,085,000 3,171,000      
Contingent payment liability 17,082,000   17,082,000 30,377,000 24,100,000 4,616,000    
Liabilities:                
Foreign Currency Contract, Asset, Fair Value Disclosure 194,000   194,000          
Available-for-sale Securities, Gross Unrealized Loss     101,000   4,530,000      
Increase (Decrease) in Notes Receivables     640,000          
Foreign Currency Exchange Rate, Translation             21,000  
Fair Value [Member]
                
Assets:                
Cash Equivalents 102,277,000   102,277,000   102,247,000      
Current marketable securities – available for sale         20,591,000      
Long-term marketable securities – available for sale         91,267,000      
Total assets 127,860,000   127,860,000   220,857,000      
Contingent payment liability 29,558,000   29,558,000   34,795,000      
Liabilities:                
Total liabilities 29,752,000   29,752,000   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 194,000   194,000   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 102,277,000   102,277,000   102,247,000      
Current marketable securities – available for sale 16,989,000   16,989,000   20,591,000      
Long-term marketable securities – available for sale 2,573,000   2,573,000   91,267,000      
Total assets 121,839,000   121,839,000   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 0   0   0      
Contingent payment liability 0   0   0      
Liabilities:                
Total liabilities 194,000   194,000   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 194,000   194,000   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 6,021,000   6,021,000   6,752,000      
Contingent payment liability 29,558,000   29,558,000   34,795,000      
Liabilities:                
Total liabilities 29,558,000   29,558,000   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 2,440,000   2,440,000   3,171,000      
Available-for-sale Securities, Current [Member]
                
Unrealized Gain (Loss) on Securities         59,000      
Liabilities:                
Available-for-sale Securities, Gross Unrealized Loss     $ 600