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Investments - Summary of Details on Realized and Unrealized Gains and Losses Related to Equity Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting period	$ 2,400
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting period	$ 18,032	$ (5,109)

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- Definition

Amount of unrealized 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

+ Details

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- References

No definition available.

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X

- Definition

Equity Securities, FV-NI, Unrealized Gain (Loss), Still Held at End of Period

+ References

No definition available.

+ Details

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