Investments in debt and equity securities - Additional Information (Detail) - Investments in mutual funds and common stock - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Pre-tax Net Gain (Loss) recognized in Income Statement	$ 1,893
Pre-tax Realized Gain (Loss) on Securities Arising During Period	170	$ 86
Net Increase (Decrease) in Unrealized Gain on Equity Securities due to changes in Fair Value	$ 1,723	3,660
Gain on Sale Of Equity Securities After Tax		$ 3,746

Gain on Sale or Redemption Of Equity Securities After Tax.

No definition available.

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- Definition

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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- Definition

Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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- Definition

Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

+ Details

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- Definition

Line items represent financial 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.

+ References

No definition available.

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