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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]        
Intangible assets – finite life, net at beginning of period     $ 29,637 $ 31,283
Amortization expense $ (1,700) $ (1,900) (5,029) (5,448)
Transfers from indefinite life classification     3,150 700
Acquisition and related adjustments     4,840
Foreign currency adjustments     (100) 102
Intangible assets – finite life, net at end of period $ 27,658 $ 31,477 $ 27,658 $ 31,477