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Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]        
Intangible assets – finite life, net at beginning of period     $ 31,283 $ 35,959
Amortization expense $ (1,900) $ (2,200) (5,448) (6,479)
Transfers from indefinite life classification     700 3,904
Acquisition     4,840  
Foreign currency adjustments     102 (132)
Intangible assets – finite life, net at end of period $ 31,477 $ 33,252 $ 31,477 $ 33,252