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Fair Value Measurement (Detail) - (Table) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Assets:      
Available-for-sale Securities, Current $ 30,714 $ 20,591 $ 21,731
Available-for-sale Securities, Noncurrent 91,945 91,267 101,478
Notes, Loans and Financing Receivable, Net, Noncurrent 2,461 3,171 3,085
Business Combination, Contingent Consideration, Liability 25,156 24,100 32,401
Liabilities:      
Foreign Currency Contract, Asset, Fair Value Disclosure 111    
Fair Value [Member]
      
Assets:      
Cash Equivalents 94,075 102,247  
Current marketable securities – available for sale   20,591  
Long-term marketable securities – available for sale   91,267  
Total assets 222,776 220,857  
Business Combination, Contingent Consideration, Liability 34,917 34,795  
Liabilities:      
Total liabilities 35,028 35,255  
Fair Value [Member] | Note receivable – related party [Member]
      
Assets:      
Notes Receivable, Fair Value Disclosure 3,581 3,581  
Fair Value [Member] | Forward contracts [Member]
      
Liabilities:      
Foreign Currency Contracts, Liability, Fair Value Disclosure 111 460  
Fair Value [Member] | Note receivable – Seller of SM Canada [Member]
      
Assets:      
Notes Receivable, Fair Value Disclosure   3,171  
Fair Value, Inputs, Level 1 [Member]
      
Assets:      
Cash Equivalents 94,075 102,247  
Current marketable securities – available for sale 30,714 20,591  
Long-term marketable securities – available for sale 91,945 91,267  
Total assets 216,734 214,105  
Business Combination, Contingent Consideration, 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] | Forward contracts [Member]
      
Liabilities:      
Foreign Currency Contracts, Liability, 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 0 0  
Business Combination, Contingent Consideration, Liability 0 0  
Liabilities:      
Total liabilities 111 460  
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] | Forward contracts [Member]
      
Liabilities:      
Foreign Currency Contracts, Liability, Fair Value Disclosure 111 460  
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 6,042 6,752  
Business Combination, Contingent Consideration, Liability 34,917 34,795  
Liabilities:      
Total liabilities 34,917 34,795  
Fair Value, Inputs, Level 3 [Member] | Note receivable – related party [Member]
      
Assets:      
Notes Receivable, Fair Value Disclosure 3,581 3,581  
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]
      
Liabilities:      
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0  
Fair Value, Inputs, Level 3 [Member] | Note receivable – Seller of SM Canada [Member]
      
Assets:      
Notes Receivable, Fair Value Disclosure $ 2,461 $ 3,171