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Supplemental Financial Information - Other Selling and Administrative Expenses (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Design and development   $ 205,368 $ 225,245 $ 215,304
Identifiable intangible asset amortization   39,095 23,273 22,215
Bad debt expense $ 11,758 $ 40,894 $ 17,568 $ 9,165