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Intangible Assets - Amortized Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 60,724 | $ 60,724
Accumulated Amortization | 50,611 | 47,535
Net Carrying Value | 10,113 | 13,189
Distribution Networks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 38,060 | 38,060
Accumulated Amortization | 38,060 | 38,060
Net Carrying Value | 0 | 0
Completed Technologies [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 13,687 | 13,687
Accumulated Amortization | 6,619 | 4,181
Net Carrying Value | 7,068 | 9,506
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 8,607 | 8,607
Accumulated Amortization | 5,716 | 5,202
Net Carrying Value | 2,891 | 3,405
Noncompete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 370 |
Accumulated Amortization | 216 |
Net Carrying Value | $ 154 |
Non-compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value |  | 370
Accumulated Amortization |  | 92
Net Carrying Value |  | $ 278

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