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Fair Value Disclosures - Narrative (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 16, 2021 | Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |
Equity method investments at fair value | $ 3,652 |  | $ 3,652 |  |  | $ 6,307
Discontinued Operations, Held-for-sale | CES |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |
Goodwill | 1,377 |  | 1,377 |  | $ 1,700 | 1,702
Loss on classification as held for sale | 325 | $ 0 | 325 | $ 0 |  |
Level 3 |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |
Equity method investments at fair value | $ 3,652 |  | $ 3,652 |  |  | $ 6,307
Level 3 | Discontinued Operations, Held-for-sale | CES | Fair Value, Nonrecurring |  |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |  |
Goodwill, fair value |  |  |  |  | $ 1,400 |

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