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Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Assets and Liabilities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Assets:        
Beginning Balance $ 1,537 $ 1,301 $ 1,508 $ 1,276
Net Unrealized/Realized Gains/Losses Included In Earnings (128) 7 (126) 10
Purchases/Acquisitions 1,661 0 1,661 0
Sales/Dispositions 0 0 (8) 0
Foreign Currency Translation Adjustments 2 (10) 37 12
Ending Balance 3,072 1,298 3,072 1,298
Liabilities:        
Beginning Balance 25,104   22,608  
Net Unrealized/Realized Gains/Losses Included In Earnings 435   3,180  
Purchases/Acquisitions 0   0  
Sales/Dispositions 0   (249)  
Foreign Currency Translation Adjustments 0   0  
Ending Balance 25,539   25,539  
Contingent Consideration Liability [Member]        
Liabilities:        
Beginning Balance 25,104   22,608  
Net Unrealized/Realized Gains/Losses Included In Earnings 435   3,180  
Purchases/Acquisitions 0   0  
Sales/Dispositions 0   (249)  
Foreign Currency Translation Adjustments 0   0  
Ending Balance 25,539   25,539  
Equities [Member]        
Assets:        
Beginning Balance 1,537 1,301 1,508 1,276
Net Unrealized/Realized Gains/Losses Included In Earnings (128) 7 (126) 10
Purchases/Acquisitions 1,661 0 1,661 0
Sales/Dispositions 0 0 (8) 0
Foreign Currency Translation Adjustments 2 (10) 37 12
Ending Balance $ 3,072 $ 1,298 $ 3,072 $ 1,298