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Fair Value Measurement (Detail) - (Table)
$ / shares in Units, number in Thousands, CAD in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Aug. 13, 2014
USD ($)
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 26,381   94,674 240,709 393,201              
Business Acquisition, Contingent Consideration, Actual Cash Payment $ 2,798,000 $ 3,483,000                    
Changes in fair value on contingent liability       $ 1,518,000 $ (142,000)              
Assets:                        
Available-for-sale Securities, Current 32,546,000   $ 31,210,000 32,546,000 31,210,000 $ 32,424,000            
Notes Receivable, Related Parties, Noncurrent 2,817,000   3,159,000 2,817,000 3,159,000 2,990,000           $ 3,000,000
Available-for-sale Securities, Noncurrent 90,144,000   89,429,000 90,144,000 89,429,000 88,465,000            
Notes receivable 1,239,000   1,299,000 1,239,000 1,299,000 1,158,000            
Contingent payment liability 0   $ 17,607,000 0 17,607,000 8,012,000            
Liabilities:                        
Foreign Currency Contract, Asset, Fair Value Disclosure $ 307,000     307,000                
Available-for-sale Securities, Gross Unrealized Loss       616,000                
Available-for-sale Securities, Gross Unrealized Gain       873,000 277,000              
Debt Instrument, Decrease, Forgiveness           409,000            
Proceeds from Collection of Notes Receivable       $ 0 $ (240,000) (466,000)            
Share based compensation arrangement by share based payment award options exercisable during period weighted average exercise price - in dollars per share | $ / shares $ 33.60   $ 25.55 $ 31.85 $ 26.70              
Repayment of Notes Receivable from Related Parties       $ (205,000) $ (204,000) (409,000)            
Increase (Decrease) in Accrued Interest Receivable, Net       $ 32,000 35,000 $ 71,000            
Foreign Currency Exchange Rate, Translation 81     81   (254)            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ (6,281,000) (2,950,000) $ 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 $ 2,771,000     2,771,000   2,242,000            
Current marketable securities – available for sale           32,424,000            
Long-term marketable securities – available for sale           88,465,000            
Total assets 129,517,000     129,517,000   127,279,000            
Contingent payment liability 20,012,000     20,012,000   24,775,000   $ 38,633,000        
Liabilities:                        
Total liabilities 20,319,000     20,319,000   24,775,000            
Fair Value [Member] | Note receivable – related party [Member]                        
Assets:                        
Notes Receivable, Fair Value Disclosure 2,817,000     2,817,000   2,990,000   3,328,000        
Fair Value [Member] | Forward contracts [Member]                        
Liabilities:                        
Foreign Currency Contracts, Liability, Fair Value Disclosure 307,000     307,000                
Fair Value [Member] | Note receivable – Seller of SM Canada [Member]                        
Assets:                        
Notes Receivable, Fair Value Disclosure 1,239,000     1,239,000   1,158,000   $ 1,878,000        
Fair Value, Inputs, Level 1 [Member]                        
Assets:                        
Cash Equivalents 2,771,000     2,771,000   2,242,000            
Current marketable securities – available for sale 32,546,000     32,546,000   32,424,000            
Long-term marketable securities – available for sale 90,144,000     90,144,000   88,465,000            
Total assets 125,461,000     125,461,000   123,131,000            
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          
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 307,000     307,000   0            
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             307,000          
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 4,056,000     4,056,000   4,148,000            
Contingent payment liability 20,012,000     20,012,000   24,775,000            
Liabilities:                        
Total liabilities 20,012,000     20,012,000   24,775,000            
Fair Value, Inputs, Level 3 [Member] | Note receivable – related party [Member]                        
Assets:                        
Notes Receivable, Fair Value Disclosure 2,817,000     2,817,000   2,990,000            
Fair Value, Inputs, Level 3 [Member] | Forward contracts [Member]                        
Liabilities:                        
Foreign Currency Contracts, Liability, Fair Value Disclosure             $ 0          
Fair Value, Inputs, Level 3 [Member] | Note receivable – Seller of SM Canada [Member]                        
Assets:                        
Notes Receivable, Fair Value Disclosure $ 1,239,000     1,239,000   $ 1,158,000            
Contingent Consideration Type [Domain]                        
Liabilities:                        
Foreign Currency Exchange Rate, Translation           (2,012)            
Dolce Vita [Member]                        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                 $ 5,000,000      
Other Long-term Investments [Member]                        
Liabilities:                        
Available-for-sale Securities, Gross Unrealized Loss       246,000 491,000              
Available-for-sale Securities, Gross Unrealized Gain         $ 110,000              
Changes Measurement [Member]                        
Liabilities:                        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ 1,518,000   $ (5,576,000)