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Fair Value Measurement (Detail) - (Table)
number in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 13, 2014
USD ($)
Assets:                  
Foreign Currency Contract, Asset, Fair Value Disclosure         $ (273,000)   $ (273,000)    
Proceeds from Collection of Notes Receivable           $ 249,000 466,000 $ 893,000  
Liabilities:                  
Business Combination, Contingent Consideration, Liability $ 0       8,012,000 0 8,012,000    
Business Acquisition, Contingent Consideration, Actual Cash Payment     $ 2,798,000 $ 3,000          
Repayment of Notes Receivable from Related Parties           409,000 409,000 409,000  
Increase (Decrease) in Accrued Interest Receivable, Net           63,000 71,000 156,000  
business combinations contingent liability payment           16,402,000 6,270,000 8,475,000  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability           (425,000) (5,576,000) (2,139,000)  
Fair Value [Member]                  
Assets:                  
Cash Equivalents 3,309,000       2,242,000 3,309,000 2,242,000    
Current marketable securities – available for sale 39,495,000       32,424,000 39,495,000 32,424,000    
Foreign Currency Contract, Asset, Fair Value Disclosure 191,000         191,000      
Long-term marketable securities – available for sale 70,559,000       88,465,000 70,559,000 88,465,000    
Total assets 113,554,000       123,131,000 113,554,000 123,131,000    
Liabilities:                  
Business Combination, Contingent Consideration, Liability 7,948,000       24,775,000 7,948,000 24,775,000 $ 38,633,000  
Total liabilities 7,948,000       24,775,000 7,948,000 24,775,000    
Fair Value, Inputs, Level 1 [Member]                  
Assets:                  
Cash Equivalents 3,309,000       2,242,000 3,309,000 2,242,000    
Current marketable securities – available for sale 39,495,000       32,424,000 39,495,000 32,424,000    
Long-term marketable securities – available for sale 70,559,000       88,465,000 70,559,000 88,465,000    
Total assets 113,363,000       123,131,000 113,363,000 123,131,000    
Liabilities:                  
Business Combination, Contingent Consideration, Liability 0       0 0 0    
Total liabilities 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 191,000       0 191,000 0    
Liabilities:                  
Business Combination, Contingent Consideration, Liability 0       0 0 0    
Total liabilities 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 0       0 0 0    
Liabilities:                  
Business Combination, Contingent Consideration, Liability 7,948,000       24,775,000 7,948,000 24,775,000    
Total liabilities $ 7,948,000       $ 24,775,000 $ 7,948,000 $ 24,775,000    
Contingent Consideration Type [Domain]                  
Foreign Currency Exchange Rate, Translation 0       (2,012) 0 (2,012)    
Dolce Vita [Member]                  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                 $ 5,000,000
Liabilities:                  
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 8,000       $ 1,019,000        
Cejon Acquisition [Member]                  
Liabilities:                  
Business Acquisition, Contingent Consideration, Actual Cash Payment   $ 1,767,000