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Components and Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Aug. 01, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 326,977 | $ 327,333 |
Spectrum Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Cash and cash equivalents |  |  | $ 10,137
Accounts receivable |  |  | 5,075
Inventory |  |  | 13,502
Prepaid expenses and other assets |  |  | 616
Fixed assets |  |  | 6,004
Deferred tax assets |  |  | 1,102
Goodwill |  |  | 265,722
Accounts payable |  |  | (1,335)
Unrecognized tax benefit |  |  | (576)
Accrued liabilities |  |  | (5,787)
Deferred tax liabilities |  |  | (43,608)
Net assets acquired |  |  | 370,932
Spectrum Inc. | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, intangible assets |  |  | 78,400
Spectrum Inc. | Technology - developed |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, intangible assets |  |  | 38,560
Spectrum Inc. | Trademark and Tradename |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, intangible assets |  |  | 2,160
Spectrum Inc. | Non-competition agreements |  |  |
Business Acquisition [Line Items] |  |  |
Business combination, intangible assets |  |  | $ 960

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