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Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Goodwill, Beginning Balance $ 391,998 $ 382,729
Acquired goodwill 16,742 13,301
Foreign currency translation adjustment 2,477 (4,032)
Goodwill, Ending Balance $ 411,217 $ 391,998