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Investments - Summary of Investments (Detail) - Parent - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Marketable securities | $ 61,401 | $ 66,424
Equity method investments | 12,230 | 11,098
Nonqualified retirement plan assets | 6,909 | 6,706
Investments in collateralized loan obligations | 5,744 | 23,339
Other investments | 925 | 925
Total investments | $ 87,209 | $ 108,492

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