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Changes In The Carrying Amounts of Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Balance as of January 1   $ 317,464 $ 148,367
Acquisition of Supreme   (1,520) 165,400
Effects of foreign currency   44 (141)
Impairment of goodwill $ (4,900) (4,944) 0
Balance as of September 30 $ 311,044 $ 311,044 $ 313,626