Investments - Summary of Investments (Detail) - Parent - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
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

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 25
-Subparagraph (a)
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-SubTopic 210
-Section S99
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Investments In Collateralized Loan Obligations

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