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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, 2018
Mar. 31, 2017
Assets:    
Beginning Balance $ 1,592 $ 1,508
Net Unrealized/Realized Gains/Losses Included In Earnings (1) 2
Purchases/Acquisitions 1 0
Sales/Dispositions 0 (8)
Foreign Currency Translation Adjustments 7 35
Ending Balance 1,599 1,537
Liabilities:    
Beginning Balance 28,941 22,608
Net Unrealized/Realized Gains/Losses Included In Earnings 33 2,745
Purchases/Acquisitions 0 0
Sales/Dispositions 0 (249)
Foreign Currency Translation Adjustments 0 0
Ending Balance 28,974 25,104
Contingent Consideration Liability [Member]    
Liabilities:    
Beginning Balance 28,941 22,608
Net Unrealized/Realized Gains/Losses Included In Earnings 33 2,745
Purchases/Acquisitions 0 0
Sales/Dispositions 0 (249)
Foreign Currency Translation Adjustments 0 0
Ending Balance 28,974 25,104
Equities [Member]    
Assets:    
Beginning Balance 1,592 1,508
Net Unrealized/Realized Gains/Losses Included In Earnings (1) 2
Purchases/Acquisitions 1 0
Sales/Dispositions 0 (8)
Foreign Currency Translation Adjustments 7 35
Ending Balance $ 1,599 $ 1,537