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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
Mar. 31, 2017
Mar. 31, 2016
Assets:    
Beginning Balance $ 1,508 $ 1,276
Net Unrealized/Realized Gains/Losses Included In Earnings 2 3
Purchases/Acquisitions 0 0
Sales/Dispositions (8) 0
Foreign Currency Translation Adjustments 35 22
Ending Balance 1,537 1,301
Liabilities:    
Beginning Balance 22,608  
Net Unrealized/Realized Gains/Losses Included In Earnings 2,745  
Purchases/Acquisitions 0  
Sales/Dispositions (249)  
Foreign Currency Translation Adjustments 0  
Ending Balance 25,104  
Contingent Consideration Liability [Member]    
Liabilities:    
Beginning Balance 22,608  
Net Unrealized/Realized Gains/Losses Included In Earnings 2,745  
Purchases/Acquisitions 0  
Sales/Dispositions (249)  
Foreign Currency Translation Adjustments 0  
Ending Balance 25,104  
Equities [Member]    
Assets:    
Beginning Balance 1,508 1,276
Net Unrealized/Realized Gains/Losses Included In Earnings 2 3
Purchases/Acquisitions 0 0
Sales/Dispositions (8) 0
Foreign Currency Translation Adjustments 35 22
Ending Balance $ 1,537 $ 1,301